My favourite singers are Avril Lavigne, Pink and Emily Haines. I think avrils voice has a very unique quality to it, even though I don't like her new stuff, her old songs are good to sing along to. And the other two are awesome live performers. As for male voices I'm a bit less picky and it just has to be a good song, but I like Dave Grohl from Foo Fighters, and the lead singer from The Killers and Yellowcard sound okay to my ears. I'm really picky about most of the stuff I listen to so they have to be able to pull off pretty good melody.