what kind of decent/good yet unusual duets can you think of, something that isnt what you would think of as a good duet when you first hear about it like "Holy crap! they actually sang together!?"
few that i can think of:
Bono and Frank Sinatra (I've Got you under my skin)
U2 and Johnny Cash (The Wanderer)
Johnny Cash and Bob Dylan (You are my sunshine)
David Bowie and Mick Jagger (Dancin' In the Street (but the video is funnier))
U2 and Pavoratti (Miss Sarajevo)