Hip hop arose in the early 1970s in The Bronx, New York City. Jamaican immigrant DJ Kool Herc is widely regarded as the progenitor of hip hop; he brought with him from Jamaica the practice of toasting over the rhythms of popular songs. Emcees originally arose to introduce the soul, funk and R&B songs that the DJs played, and to keep the crowd excited and dancing; over time, the DJs began isolating the percussion break of songs (when the rhythm climaxes), producing a repeated beat that the emcees rapped over.