A rapper is a musician who performs rap or hip-hop music. Rapping is a musical form of vocal delivery that incorporates "rhyme, rhythmic speech, and street vernacular". The term "rapper" refers to a performer who raps. The first rappers were MCs who talked between songs to entertain the crowd while the DJs changed records, then the MCs started talking with the beat, and then rap was born. Becoming a rapper requires the ability to write intricate lyrics and perform them. African-American English has always had a significant effect on hip-hop slang and vice versa. Some hip-hop listeners believe that a rappers lyrics are enhanced by a complex vocabulary.