This is a story of musical innovation: Milestones in advancing music from the earliest Stone Age indications of possible musical activity to contemporary art-music, jazz, rock and varieties of pop music. Not necessarily by the most famous composers, nor the ones most played, but the innovative ones that extended the framework of ideas for writing music, some in a small way, some with breathtaking novelty. You can listen to the music discussed while reading, through links to or playlists provided at streaming services (that are free if you accept occasional advertising). The book is eminently suitable for use in music teaching at high schools or as a reference tool in dedicated music schools.