Well, the other two guys are pretty distinctive vocally. One has a gruff, "Tom Waitts-like" voice ans the other is smoother.

By the way, I just got back (it's 3:15AM) from a Queens of the Stone Age show. Freakin' incredible (again, if you like the music). They played with the Burning Brides and ...and You Will Know Us By the Trail of Dead. Both bands were great. All bands were great. I skipped classes. It was fun.