万本电子书0元读

万本电子书0元读

Jack and The Beanstalk and Other Fairy Tales
Jack and The Beanstalk and Other Fairy Tales
Andrew Lang
¥40.79
Once upon a time there was a poor widow who lived in a little cottage with her only son Jack. Jack was a giddy, thoughtless boy, but very kind-hearted and affectionate. There had been a hard winter, and after it the poor woman had suffered from fever and ...
J’aime fumer… et je vais arrêter!: Devenez non-fumeur en 30 jours
J’aime fumer… et je vais arrêter!: Devenez non-fumeur en 30 jours
Andreas Jopp
¥72.76
Jaime fumer...et je vais arrêter ! Devenez non-fumeur sans prendre de poids. Le Livre est un succès international, déjà traduit en 10 langues! Ce n’est qu’en découvrant et en comprenant pourquoi vous aimez fumer que vous pourrez arrêter la cigarette sans avoir l’impression de renoncer à quelque chose d’important. **PERMIS DE FUMER** Si vous lisez ce livre, vous allez pouvoir continuer à fumer… Au fil des pages, Andreas Jopp explique point par point et avec humour les schémas de pensée qui empêchent d’arrêter. Il démontre comment la nicotine déprogramme le cerveau, rend vulnérable au stress et empêche de trouver le calme. Une fois ces mécanismes compris, vous pourrez arrêter sans difficulté. Et durablement. **NE PAS PRENDRE DE POIDS** Arrêter de fumer est plus facile quand on n’a pas tout le temps faim et qu’on se sent bien. Avec les conseils alimentaires d’Andreas Jopp, vous pourrez manger davantage sans prendre de poids. **LES QUESTIONS SUIVANTES SERONT REPONDUES** EST-CE QUE VOUS AIMEZ FUMER -Comment la nicotine transforme notre cerveau et sentiment desatisfaction -Pourquoi on se sent mieux quand on fume -Et si l’addiction au tabac était plus forte et plus rapide à cause des additifs -Pourquoi les cigarettes légères sont plus dangereuses que lesnormales LA CIGARETTE ET LE MENTAL -Les fumeurs ont-ils des sautes d’humeur plus fréquentes et desproblèmes de concentration -Pourquoi on fume plus quand on est stressé. -Pourquoi on a l’impression que la cigarette nous relaxe. -Fumer rend-il plus éveillé et plus concentré -Les ex-fumeurs sont-ils moins satisfaits que les fumeurs LES STRATGIES LES PLUS EFFiCACES POUR ARRTER DE FUMER -Pourquoi l’hypnose marche pour arrêter de fumer -La meilleure faon de faire face aux symptmes du sevrage. -Comment éviter les reculades et les rechutes. ARRTER DE FUMER, RESTER MINCE -Les fumeurs sont-ils plus minces que les non-fumeurs La réalité -Comment garder tout simplement son poids en arrêtant de fumer. -Pourquoi le sucré entretient la dépendance à la nicotine. -Comment gérer au mieux son poids, sa faim et sa bonne humeur. -Conseils pratiques et listes de course pour rester mince EN MEILLEURE FORME -Améliorer votre soufe et votre condition physique -Réduire rapidement les risques d’infarctus et de cancers Andreas Jopp **Journaliste médical, coach pour non-fumeurs et auteur de best-sellers. **Andreas Jopp travaille aussi depuis 10 ans avec l'hypnose chez les fumeurs. **L'hypnose fait partie des stratégies les plus efficaces contre le tabac ! *Pour les MP3 de hypnose: www.nichtraucherin30Tagen.de/francais**
The Illumination of the Heart: Experiencing a Divine Miracle
The Illumination of the Heart: Experiencing a Divine Miracle
Zinovia Dushkova
¥40.79
"The entrance of the Messiah in this period — 1998," predicted Edgar Cayce in 1932. His prediction accurately came true, but very few people knew about this... until now.Where and how did the Messiah descend into the earthly world, predicted long ago, but wholly unnoticed?In Book 2 of The Teaching of the Heart series, the Lord, for the first time in history, unveils this Secret. He entrusts all human hearts to witness the greatest and most unprecedented Miracle of the Divine Incarnation of His Son, which took place in 1998 within several worlds as the first stage of the Advent.However, not only will you behold this Miracle as if through your own eyes, but you will also experience it within your own heart. As you read the powerfully poetic pages of this book, an imperceptible mystery will occur inside you: the Divine Love of the Lord will transfigure the essence of your entire being, preparing you to become a particle of His human entity at the time of the Great Advent.Offering spiritual food for further deep reflections, The Teaching of the Heart continues to provide you with inspirational and illuminating instructions from the Lord of Love and Compassion to transform the whole world through self-perfection.Will you let the Saviour be born inside your heart?
Swift High Performance
Swift High Performance
Kostiantyn Koval
¥63.21
Leverage Swift and enhance your code to take your applications to the next levelAbout This BookBuild solid, high performance applications in SwiftIncrease your efficiency by getting to grips with concurrency and parallel programmingUse Swift to design performance-oriented solutionsWho This Book Is ForThis book is aimed at experienced Swift developers wanting to optimize their programs on Apple platforms to optimize application performance.What You Will LearnBuild solid, stable, and reliable applications using SwiftUse REPL and Pl to manage and configure relational databasesExplore Swift's features including its static type system, value objects, and functional programming Design reusable code for high performance in SwiftUse to Xcode LLBD and REPL to debug commandsAvoid sharing resources by using concurrency and parallel programmingUnderstand the lazy loading pattern, lazy sequences, and lazy evolution.In DetailSwift is one of the most popular and powerful programming languages for building iOS and Mac OS applications, and continues to evolve with new features and capabilities. Swift is considered a replacement to Objective-C and has performance advantages over Objective-C and Python. Swift adopts safe programming patterns and adds modern features to make programming easier, more flexible, and more fun.Develop Swift and discover best practices that allow you to build solid applications and optimize their performance.First, a few of performance characteristics of Swift will be explained. You will implement new tools available in Swift, including Playgrounds and REPL. These will improve your code efficiency, enable you to analyse Swift code, and enhance performance. Next, the importance of building solid applications using multithreading concurrency and multi-core device architecture is covered, before moving on to best practices and techniques that you should utilize when building high performance applications, such as concurrency and lazy-loading. Finally, you will explore the underlying structure of Swift further, and learn how to disassemble and compile Swift code.Style and approachThis is a comprehensive guide to enhancing Swift programming techniques and methodology to enable faster application development.
Unity 5 Game Optimization
Unity 5 Game Optimization
Chris Dickinson
¥80.65
Master performance optimization for Unity3D applications with tips and techniques that cover every aspect of the Unity3D EngineAbout This BookOptimize CPU cycles, memory usage, and GPU throughput for any Unity3D applicationMaster optimization techniques across all Unity Engine features including Scripting, Asset Management, Physics, Graphics Features, and ShadersA practical guide to exploring Unity Engine's many performance-enhancing methodsWho This Book Is ForThis book is intended for intermediate and advanced Unity developers who have experience with most of Unity’s feature-set, and who want to maximize the performance of their game. Familiarity with the C# language will be needed.What You Will LearnUse the Unity Profiler to find bottlenecks anywhere in our application, and discover how to resolve themImplement best-practices for C# *ing to avoid common pitfallsDevelop a solid understanding of the rendering pipeline, and maximize its performance through reducing draw calls and avoiding fill rate bottlenecksEnhance shaders in a way that is accessible to most developers, optimizing them through subtle yet effective performance tweaksKeep our scenes as dynamic as possible by making the most of the Physics engineOrganize, filter, and compress our art assets to maximize performance while maintaining high qualityPull back the veil on the Mono Framework and the C# Language to implement low-level enhancements that maximize memory usage and avoid garbage collectionGet to know the best practices for project organization to save time through an improved workflowIn DetailCompetition within the gaming industry has become significantly fiercer in recent years with the adoption of game development frameworks such as Unity3D. Through its massive feature-set and ease-of-use, Unity helps put some of the best processing and rendering technology in the hands of hobbyists and professionals alike. This has led to an enormous explosion of talent, which has made it critical to ensure our games stand out from the crowd through a high level of quality. A good user experience is essential to create a solid product that our users will enjoy for many years to come.Nothing turns gamers away from a game faster than a poor user-experience. Input latency, slow rendering, broken physics, stutters, freezes, and crashes are among a gamer’s worst nightmares and it’s up to us as game developers to ensure this never happens. High performance does not need to be limited to games with the biggest teams and budgets.Initially, you will explore the major features of the Unity3D Engine from top to bottom, investigating a multitude of ways we can improve application performance starting with the detection and analysis of bottlenecks. You’ll then gain an understanding of possible solutions and how to implement them. You will then learn everything you need to know about where performance bottlenecks can be found, why they happen, and how to work around them.This book gathers a massive wealth of knowledge together in one place, saving many hours of research and can be used as a quick reference to solve specific issues that arise during product development.Style and approachThis book is organized based on the major features of Unity engine and should be treated as a reference guide. It is written as a series of investigations into both common and unusual performance pitfalls, each including a study on why the bottleneck is causing us problems, and a list of enhancements or features that can be used to work around them. Differences in effectiveness, behaviors, or feature-sets between Unity 4.x and Unity 5.x will be highlighted.
QlikView Unlocked
QlikView Unlocked
Roger Stone
¥71.93
Unlock more than 50 amazing tips and tricks to enhance your QlikView skillsAbout This BookLearn QlikView development best practices from the expertsDiscover valuable tips, tricks, and undocumented featuresA fast-paced guide with techniques and best practices to optimize high-performance, robust, and scalable applicationsWho This Book Is ForQlikView Unlocked is intended for anyone with at least some experience in designing, developing, or supporting QlikView applications. Whether you are new to QlikView or are a seasoned developer, there is something for everyone in this book.What You Will LearnBuild the QlikView environment correctly so that it is flexible and robustDeliver a successful QlikView projectUnderstand and implement QlikView best practicesDiscover the best way to prototype, develop, and deploy applicationsOvercome data modeling challengesExplore the in’s and out’s of Section AccessSolve post-deployment issues in Server and PublisherIn DetailQlikView is considered as one of the most used tool for Business Intelligence (BI). An efficient BI tool should provide five important capabilities for effective data analysis—collection (gathering important information), reporting, analysis (the ability to interact with data), visualization (the presentation of data), and discovery (exploring data). QlikView offers all these necessary skills required to deal with big data in real-world scenarios.QlikView Unlocked will provide you with new insights to get the very best from QlikView. This book will help you to develop skills to work with data efficiently. We will cover all the secrets of unleashing the full power of QlikView, which will enable you to make better use of the tool and create better results for future projects.In the course of this book, we will walk you through techniques and best practices that will enable you to be more productive. You will gain quick insights into the tool with the help of short steps called ”keys,” which will help you discover new features of QlikView. Moving on you will learn new techniques for data visualization, *ing, data modeling, and more. This book will then cover best practices to help you establish an efficient system with improved performance. We will also teach you some tricks that will help you speed up development processes, monitor data with dashboards, and so on.By the end of this book, you will have gained beneficial tips, tricks, and techniques to enhance the overall experience of working with QlikView.Style and approachWritten in a fairly informal style, this is a book that can be read cover-to-cover or simply used as a ”how-to” reference. Using real-world examples with clear explanations, code samples, and screenshots, you will be able understand each topic fully. You will be able to apply the knowledge gained to your QlikView projects.
Mr Good Enough: The case for choosing a Real Man over holding out for Mr Perfect
Mr Good Enough: The case for choosing a Real Man over holding out for Mr Perfect
Lori Gottlieb
¥73.58
Lori Gottlieb suggests the unthinkable: what if she, and single women everywhere, need to stop chasing the elusive Mr Perfect and instead opt for Mr Good Enough? Embarking on her own journey to find the ideal partner, Lori explores a prevalent issue facing women today - how do you reconcile a strong desire for a husband and family without wanting to settle for anything less than the perfect package…? After interviewing a range of people from behavioural therapists to marriage counsellors, neuropsychologists to divorce lawyers, as well as single and married men and women from their twenties right up to their sixties, Lori is well placed to offer an answer Mr Good Enough is this year's intelligent, eye-opening insight into modern relationships - a fast, funny read which 'might just be a formula for marital bliss' The Times
The Bicycle Book
The Bicycle Book
Bella Bathurst
¥72.40
A rip-roaring narrative celebration of the 21st century’s great transport success story: the bicycle. Millions of us now cycle, some obsessively, and this glorious concoction of history, anecdote, adventure and lycra-clad pedalling is the perfect read for two-wheelers of all kinds. ‘At last – a bicycle book for the rest of us…. A book for the sort of cyclist who likes cycling and reading and stories.’ Guardian Two wheels. A frame. Two pedals. What could be simpler than a bicycle? And yet the bike continues to inspire a passionate following. Since the millennium its use in Britain has doubled, and then doubled again. Thousands now cycle to work, with more and more taking it up every day. Acclaimed author Bella Bathurst takes us on a journey through cycling’s best stories and strangest incarnations, from the bicycle as a weapon of warfare to the secret life of couriers and the alchemy of framebuilding. With a cast of characters including the woman who watercycled across the Channel, the man who raced India’s Deccan Queen train and several of today’s top cyclists, she offers us a brilliantly engaging portrait of cycling’s past, present and world-conquering future.
At the Zoo
At the Zoo
Kim Mitzo Thompson
¥24.44
Take a walk through the zoo and count from 1 to 10 with all of your favorite zoo animals. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Green, Green Froggy
Green, Green Froggy
Kim Mitzo Thompson
¥24.44
Learn the different colors of the rainbow through lyrical, rhyming text in this vividly-designed book. Each color is paired with a photograph of an animal, food or plant, so that young readers will recognize where they see the colors in their day-to-day lives. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
My Day
My Day
Kim Mitzo Thompson
¥24.44
Learn day-to-day words with this adorable book from the Baby’s First Books Collection. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Jolly Old St.Nicholas
Jolly Old St.Nicholas
Kim Mitzo Thompson
¥24.44
The magic of Christmas comes alive with this classic letter to Santa. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Up on the Housetop
Up on the Housetop
Kim Mitzo Thompson
¥24.44
Follow Santa on this Christmas night as his reindeer land on the housetop. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Noah and the Ark
Noah and the Ark
Kim Mitzo Thompson
¥24.44
Join Noah as he builds an ark for his family and all the living creatures of the earth in obedience to God. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
David and Goliath
David and Goliath
Kim Mitzo Thompson
¥24.44
Join David as he wins an unlikely fight with Goliath, the giant. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Five Trick-or-Treaters
Five Trick-or-Treaters
Kim Mitzo Thompson
¥24.44
Follow five costumed children on a trick-or-treating adventure. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Farm Animals Collection
Farm Animals Collection
Kim Mitzo Thompson
¥24.44
Explore Mr. Conway’s farm and see what all of the farm animals are up to. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Diez En La Cama
Diez En La Cama
Kim Mitzo Thompson
¥24.44
Children will laugh as they learn to count from 1 to 10 in this delightfully illustrated book. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Let's Play
Let's Play
Kim Mitzo Thompson
¥24.44
Learn new playtime words with this fun-loving book from the Baby’s First Books Collection. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
It's Silly Time
It's Silly Time
Kim Mitzo Thompson
¥24.44
Children will love this fun, delightfully illustrated book about being silly. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.
Rescue Ready Sound Book
Rescue Ready Sound Book
Kim Mitzo Thompson
¥24.44
Learn what all of the different rescue vehicles sound like in this educational book. Based in Stow, Ohio, Twin Sisters Productions has been dedicated to producing quality educational and inspirational music resources for over 25 years. Fraternal twins Karen Mitzo Hilderbrand and Kim Mitzo Thompson founded the company when they realized Kim’s success teaching third grade math through her catchy multiplication song could help children beyond her classroom. From there, Twin Sisters expanded its product line to include e-books, digital music, CDs, read-along and sing-along books, floor puzzles and educational workbooks, all with the purpose of learning through music. These internationally sold products have received nearly 170 awards, including nine Record Industry Association of America (RIAA) certified Gold albums and one Platinum albu, over the years for excellence, creativity and amusement. With thousands of songs and 35 million albums sold, Twin Sisters positions itself as the leader in children’s educational music.