The document summarizes American music over the past 100 years from the 1920s to the 2000s. It describes the evolution of popular music genres such as jazz, blues, swing, rock, disco, punk, hip hop and pop. Key developments included jazz rising in the 1920s, the emergence of rock and roll in the 1950s, the British Invasion of the 1960s, disco and punk in the 1970s, and hip hop in the 1980s. New technologies like MTV and the iPod also influenced the industry. Overall, American music changed greatly in sound and business over the past century.