had been the center of the world in hip-hop. the south for the most part hadn't really made itself heard. and that starts to change in the 2000s. and you're getting outkast. and outkast is amazing. ♪ ♪ one, two, one, two, three >> outkast became rap's beatles in the 2000s because we found both but particularly andre becoming more obsessed with a kind of adventurous landscape of music. ♪ ♪ like i'm scared of the dark >> hip-hop knew about outkast. but then they come out with an album "speakerboxx" and "the love below." and they have this song called "hey ya." ♪ it's barely a hip-hop song really. i'm not sure what it is. but it's got this kind of frothy '60s vibe. it sounds like something motown