See, I misunderstood the question. After reading Bing’s choice of Freddy Mercury, I thought the point was to pick a singer who’d be the frontman for your band. If it was that, then yeah, Diamond Dave is still my pick. But he’s not the best singer in the world by any stretch of the means.
Singer, for me, wow, that’s a little more tough. I’m going to come out of left field for this one and go with Ian Moore. Sure, he’s not the best singer in the world, but you can hear how passionate he is about what he’s singing, etc.
For a female, because I like nothing more than a woman who can sing (and I mean sing, dammit, not some Brit-Jess-Christina hybrid) I’d go with Billie Holliday. I also like Dido’s voice, too.
Okay, that’s enough out of me for one day.