The document discusses 20th century music and provides historical context. It summarizes major events of the 20th century like the World Wars, civil rights movements, and technological advances. It then lists famous people from the era and influential artists/composers like Picasso, Stravinsky, and Cage. The document characterizes 20th century music as breaking rules and looking toward the future. It outlines different styles that emerged such as serialism, minimalism, and electronic music. Finally, it highlights Stravinsky's Rite of Spring as one of the most important compositions of the 20th century.