Here's a good one, as opposed to singer/guitarist duos with great chemistry, how about just duos of singers with excellent chemistry (or hypothetical ones you think would work great together)? I'm gonna put out the big obvious one right here to get it over with: McCartney and Lennon Queen fanboying: Mercury and Bowie (together forever, made in heaven, ) Mercury and Jackson (few recordings, all excellent) Mercury and May Mercury and Taylor Mercury and Mercury ;)