Neil Young has an instantly recognizable voice. But then, he's a Canadian. So does he count?
Billy Corgan's a good one though. Still, I was a huge pumpkins fan and even then his voice was a bit grating.
You want grating? Isaak Brock of Modest Mouse. That's some good stuff though. His voice works perfectly with their sound. Too bad about their drummer. He was an integral part of that band.
Well, did I get off topic enough?