One of the newer styles of rock and roll is rap. Rap is the form of dance music in which the singer sing—rappers—speak in rhythm and rhyme rather than sing. Rap first appeared in the mid-seventies in the discos of New York City’s black neighborhoods. Disco Djs teamed up with rappers to play songs for dancers at parties. At first, the role of the rapper was to keep the beat going with hand claps while the Djs changed records. Soon, rappers added lyrics, slogans, rhyme, and call-and-response exchanges with the audiences. Early rap songs were mainly about dancing, partying, and the romantic adventures of the rappers, but politics became an important theme in the late eighties and nineties. Although rap is primarily the music of young black males, the first white rappers appeared in 1980, and a woman rapper, Queen Latifah, began her career in 1989. M.C Hammer’s 1990 album Please Hammer Don’t Hurt “Em, has sold fifteen million copies, making it the best-selling rap album of the decade.