According to a Variety article from 1972, at the time P&G managed to get all of it's soaps in a block on CBS. they were pressuring NBC to move Somerset to 3.30 following AW now that EON was not airing in that slot on CBS. NBC refused saying that Return to Peyton Place had built to a 30 share in that slot and they were happy with that.
Okay, found the date (but not yet the clip) for Philip's performance. Tuesday, Aug. 21, 2001. Two days later, Chloe and Brady sang from The Sound of Music. Oh, and if this wasn't enough earnest singing, the teen characters apparently also sang "Michael Row the Boat Ashore." Lest we forget, they were all in Puerto Rico ostensibly for a class trip on ecosystems.