Arnold Schoenberg was an Austrian composer and music theorist who is considered one of the most important figures in 20th-century music.

Serialism is a musical technique that involves organizing musical elements, such as pitch and duration, in a predetermined order.

John Cage was an American composer, artist, and writer who is considered one of the most important figures in 20th-century experimental music.

Jazz is a music genre that originated in the African-American communities of New Orleans in the late 19th and early 20th centuries.

Igor Stravinsky was a Russian composer, pianist, and conductor who is considered one of the most important figures in 20th-century music.

Rock and Roll is a music genre that originated in the United States in the 1950s and quickly spread to other parts of the world.

Pierre Boulez was a French composer, conductor, and music theorist who is considered one of the most important figures in 20th-century music.

Psychedelic Rock is a music genre that emerged in the mid-1960s and is characterized by its use of psychedelic drugs, experimental sounds, and distorted vocals.

Philip Glass is an American composer and pianist who is considered one of the most important figures in 20th-century minimalist music.

Disco is a music genre that emerged in the 1970s and is characterized by its use of synthesizers, drum machines, and electronic effects.

John Adams is an American composer and conductor who is considered one of the most important figures in 20th-century American classical music.

Hip Hop is a music genre that emerged in the 1980s and is characterized by its use of sampling, scratching, and rapping.

John Corigliano is an American composer who is known for his operas, orchestral works, and chamber music.

Electronic Dance Music is a music genre that emerged in the 1990s and is characterized by its use of electronic dance music, trance, and techno.

John Adams is an American composer and conductor who is considered one of the most important figures in 20th-century American classical music.