Hip hop is a cultural movement, of which music is a part. Hip hop music for the most part is itself composed of two parts: rapping, the delivery of swift, highly rhythmic and lyrical vocals; and DJing and/or producing, the production of instrumentation through sampling, instrumentation, turntablism, or beatboxing, the production of musical sounds through vocalized tones. 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.