studied things where they were moving tapes around and make these interesting sonic loops. and when dennis was not there, i said, why don't we just take a bar out of "night fever," it's a little slower tempo. we'll slow it down a little bit. and see if we can make a loop out of it. ♪ >> we found a bar that we thought had a really nice feel to it. we copied it over to a half inch track and spliced the tape into a loop. >> i was pretty good at imagining what you might be able to do, but carl was able to make it happen. >> it was just necessity being the mother of invention. >> no one had taken a drum beat before and created a two-bar phrase. we were breaking new ground. this is the first time we had ever taken the song and built it piece by piece from the ground