the beat ♪ ♪ to the boogie to the rhythm of the boogie the beat ♪ >> what you hear is not a -- rock to the beat me the groove and my friends are going to try to move your feet. >> what's great about the song is that's where hip-hop gets its name from. >> we didn't know it was called "rapper's delight." >> so when people talk about it, they go what is that hip-hop song? it was the first to crack the top 40. it changed everything. >> "rapper's delight" in 1979 opens the door to the last new american art form, which is hip-hop.