Well, I remember I once commented that I wouldn't be worthy of having John Lennon's "Imagine" played, but I think I'll ultimately change my mind about that. Cat Steven's "Father And Son" could make the mix. Maybe ELO's "Wild West Hero" would sneak in there... Pink Floyd's "Shine On You Crazy Diamond" would probably be too long, as would The Moody Blues' "Nights In White Satin"... their song "Watching And Waiting" comes in around four minutes though...
Originally I planned to have all these happy/humorous songs!
However, my favourite songs are mostly rather emotional, if not depressing, so it wouldn't really be representative of me to have happy/humorous songs...