up. and we started with the drum loop. and then we did a bass line. and then a guitar part. never again would we rely as much on the liveness. we would always know we could construct the song and put the pieces together based on the original vision of the song and how we imagined it. >> i got back to the sessions, and there was just a buzz. >> when we did it, we thought, we're just doing this temporarily. when dennis comes back, we'll replace it with real drums. what happened was the feel was so amazing, we couldn't get away from it. >> i could tell from the first listen, i said, man, that is amazing. >> when you listen to the drum track on "staying alive" by itself, it's really this super-rugged, tough thing. it's like -- it's not pretty or pop like you