>> it's 1979 and i heard chic's "good times" come on. i kept hearing somebody talk over the song. ♪ you hip, you hop, you don't stop ♪ ♪ and rock it out baby b ♪ what you hear is not a test i'm rapping to the beat ♪ ♪ me the group and my friend are going to try to move your feet ♪ >> so when people talk about it what's that hip-hop song and it was the first hip-hop song to crack the top 40. it changed everything. >> "rappers delight" opens the incredible door to the last new american art form which is hip-hop.