Totally tubular, Trey, around 4:40, hits upon groove, absolutely chill and pitch-perfect smooth (check out the audience's reaction) before leaning into his effects, matched by Page, who, on point, creates sounds which slowly ebb and flow, arriving in huge, bend-but-never-breaking waves.

Page jumps to his concert piano, Trey (in sound) follows suit, and the jam lifts off with the band slowly building to a sustained and euphoric peak.