Rapping is a musical form of vocal delivery that incorporates "rhyme, rhythmic speech, and street vernacular", which is performed or chanted in a variety of ways, usually over a backing beat or musical accompaniment. The components of rap include "content", "flow", and "delivery". Rap differs from spoken-word poetry in that it is usually performed off time to musical accompaniment. Rap being a primary ingredient of hip hop music, it is commonly associated with that genre in particular; however, the origins of rap predate hip-hop culture by many years.