A long time back I tried to create a comprehensive "mix tape" that was my way of spanning Paul's who career. I don't think I ever finished what I started - but my basic idea was to group songs with similar instrumentation together - and to not worry if I wandered into Beatle territory in places... in essence, a collection that would never be released. I didn't even restrict my "mix tape" from using "extra curricular" efforts where the song was released by another artist. I think I started with "I'm The Urban Spaceman" and wandered quickly into "Cosmically Conscious" after a track with Donovan, probably "Atlantis", maybe "Mellow Yellow"... I'm not even sure anymore that "Atlantis" or "Mellow Yellow" qualifies as a track that involves Paul - but I remember thinking for years that it was Paul singing backing vocals on those two songs- so they were always "Paul" tracks in my mind. It's easy to see why I never finished the project... just too much music to curate.