Bollywood Boy and Little Princess dance to the boogie Woogie beat. Boogie-woogie is a genre of blues music that became popular during the late 1920s, developed in African-American communities in the 1870s. 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 associated with dancing and Boogie-woogie dance. Boogie-woogie is not strictly a solo piano style; it can accompany singers and be featured in orchestras and small combos. It is sometimes called “eight to the bar”, as much of it is written in common time using eighth notes (quavers). The chord progressions are typically based on I–IV–V–I (with many formal variations of it, such as I/i–IV/iv–v/I, as well as chords that lead into these ones).