Hip hop began in The Bronx, located in New York City, when DJs began isolating the percussion break from funk and disco songs. The early role of the MC was to introduce the DJ and the music and to keep the audience excited. MCs began by speaking between songs, giving exhortations to dance, greetings to audience members, jokes and anecdotes. Eventually this practice became more stylized and became known as rapping. By 1979 hip hop had become a commercially popular music genre and began to enter the American mainstream. In the 1990s, a form of hip hop called gangsta rap became a major part of American music, causing significant controversy over lyrics which were perceived as promoting violence, terrorism, promiscuity, drug use and misogyny. Nevertheless, by the beginning of the 2000s, hip hop was a staple of popular music charts and was being performed in many styles across the world