What about when Axl sang Knockin on Heaven's Door with U2?
Pure crap. nobody knew what the hell they were doing. Axl sang it his way, Bono sang it his way and I don't even think The Edge knew what he was playing. It was pretty much aweful
Favorite duet......I'm having a hard time thinking of some off the top of my head. heres a few that are good.
Gone Till November - Wycleff Jean w/ Soul Asylum
Keep on Rockin in the free World - Pearl Jam w/ Bono
Bohemian Rapsody - Elton John w/ Axl
When the Stars go Blue - The Coors w/ Bono