The 32-bar form, also known as the AABA song form, American popular song form and the ballad form, is a song structure commonly found in Tin Pan Alley songs and other American popular music, especially in the first half of the 20th century.

Music history of the United States includes many styles of folk, popular and classical music. Some of the best-known genres of American music are rhythm and blues, jazz, rock and roll, rock, soul, hip hop, pop, and country. The history began with the Native Americans, the first people to populate North America.