From the very earliest experiments on vibrating strings and primitive sound makers to the latest concerns of digital sound recording, MP3 files, and information theory, this book explores the relationship between physics and music in an entertaining, user-friendly way. It provides an easy-to-understand introduction to the physics involved in every stage of the music making process. The book also narrates the story of our developing concept of the universe we live in: from the ancient visions of a cosmos regulated by the music of the spheres to our current understanding of an expanding universe controlled by the laws of quantum mechanics and string theory.