record. it wasn't so much about a style as it was an aesthetic of dancing. >> they have all types of people here, people who dance, people hop up and down. you can get high, stay here all night. >> why are people dancing again? >> i wish i knew. but i'm glad it's happening. >> what we now know as disco really starts with a band called the tramps. the drummer, they're all young, invents the idea of "four on the floor" with eight on the hi-hat. so everything is -- that's the sound of disco. >> i love disco. i always loved dance music anyway, because whatever i did as a producer was always danceable. >> giorgio moroder, working out of munich, put together