I've just come across "Stolen Voices", an interesting "bootleg remix album featuring rare or unreleased tracks and long-lost demos" from Norman Records.
It features originals by the likes of the Supremes, Harry Nilsson, Billy MacKenzie, David Bowie, Dennis Wilson, John Lennon... (If you're interested there are more details of the original sources here.)
My favourite track is this Todd Rundgren song recorded from a live performance in 1971. An interestingly angular melody which puts me in mind of another band I mention from time to time. The backing track is a bit X-Files, but I think it works quite well.
And can you spot the part where he forgets the lyric?