Hip hop is both a musical and cultural genre/movement that was developed predominantly in urban communities over the last three decades. Since first emerging from New York City in the seventies, hip hop has grown to encompass not just rapping, but an entire lifestyle that consistently incorporates diverse elements of ethnicity, technology, art and urban life. There are four fundamental elements in hip hop: hip hop dance (notably breakdancing), urban inspired art (notably graffiti), DJing and MCing. During the early 70s, a Jamaican DJ called Kool Herc arrived in New York City. Herc introduced the Jamaican tradition of "toasting," or boasting impromptu poetry and sayings over Reggae, Disco and Funk records. Herc also was the originator of break-beat deejaying, where the breaks of funk songs - being the most danceable part, often featuring percussion - were isolated and repeated for the purpose of all-night dance parties. Later DJs such as Grandmaster Flash refined and developed the use of breakbeats, including cutting. Herc's idea was soon widely copied, and by the late 70's a myriad of DJ's were releasing 12" cuts where they would rap to the beat. Popular tunes included Kurtis Blow's The Breaks, and The Sugar Hill Gang's Rapper's Delight. Hip hop as a culture was further defined in 1983, when former Black Spades gang member Afrika Bambaataa and the Soul Sonic Force released a track called Planet Rock. Instead of simply rapping over disco beats, Bambaataa created an innovative electronic sound, taking advantage of the rapidly improving drum machine and synthesizer technology. Many credit the sensation caused by the track as the defining moment in hip hop music and culture. Hip hop has since left an ever-evolving legacy of sick beats and slick rhymes to this day, and shows no signs of slowing down.