Rapping, also known as Emceeing, Flowing, MCing, Rhyme spitting, Spitting, or Rhyming, is the rhythmic delivery of rhymes, one of the central elements of hip hop music and culture. Although the word rap has sometimes been claimed to be a backronym of the phrase "Rhythmic American Poetry", "Rhythm and Poetry", "Rhythmically Applied Poetry", or "Rhythmically Associated Poetry", use of the word to describe quick and slangy speech or repartee long predates the musical form.[1] Rapping can be delivered over a beat or without accompaniment. Stylistically, rap occupies a grey area among speech, prose, poetry, and song. Rap is derived from the griots (folk poets) of West Africa, Caribbean-style toasting, and American Blues and Jazz roots. Rapping developed both inside and outside of hip hop since Jamaican expatriate Kool Herc first began doing his dancehall toasting in New York in the 1970s. In the 1980s, the success of groups like Run-DMC led to a huge wave of commercialized rap music. By the end of the 1990s, hip hop became widely accepted in mainstream music. Underground Hip-hop rapping from the 2000s has complex rhythms, cadences, an intricate poetic form, and inventive wordplay. Rap lyrics convey the street life from which hip hop originally emerged with references to popular culture and hip-hop slang. Although rap has become an international phenomenon, many types of rap deal with issues such as race, socioeconomic class, and gender.