Hip hop emerged in the 1970s in lower class urban areas and was comprised of four main elements: graffiti art, breakdancing, DJing, and rapping. It started as a form of playful rhyming and developed into a culture with its own music, art, fashion, and language. DJ Kool Herc was influential in developing hip hop music by mixing records to encourage dancing. Early rappers like Grandmaster Flash rapped about topics like sex, drugs, and partying, helping establish rap as a musical genre within hip hop culture. Hip hop culture continues to influence fashion and language over time.