This accompanies BBC2's major new TV series and The Story of Music in 50 Pieces on Radio 3. In his dynamic tour through 40,000 years of music, from prehistoric instruments to modern-day pop, Howard Goodall leads us through the story of music as it happened, idea żeby idea, so that each musical innovation - harmony, notation, sung theatre, the orchestra, dance music, recording, broadcasting - strikes us with its original force. He focuses on what changed when and why, picking out the discoveries that revolutionised man-made sound and bringing to life musical visionaries from the little-known Perotin to the colossus of Wagner. Along the way, he also gives refreshingly clear descriptions of what music is and how it works: what scales are all about, why some chords sound discordant and what all post-war pop songs have in common.