Boogie-woogie is a genre of blues music that became popular during the late 1920s, developed in African-American communities since the 1870s.^[1] It was eventually extended from piano to piano duo and trio, guitar, big band, country and western music, and gospel. While standard blues traditionally expresses a variety of emotions, boogie-woogie is mainly dance music^[2] (although not usually played for the competitive dance known as boogie-woogie (dance), a term of convenience in that sport). The genre had a significant influence on rhythm and blues and rock and roll.