I like many of the people that sing on the station I listen to in the car.

To be more specific....
Dave Matthews Band
Duncan Sheik
Jennifer Knapp (not on my station)
Fiona Apple
Lenny Kravitz
Incubis
Sara McLaughlin
Tori Amos
Nathalie Murchant

etc, etc.

I also love "old" music...you know, like Nat King Cole and that sort of stuff...