Hmm...cool topic.

My all time favorite band is Guster.

as for the rest....let's see, I don't have favorites, per se, so, these are just ones I can think of that I enjoy and are no particular order!

2 - U2
3 - Nickel Creek
4 - Morcheeba
5 - Grateful Dead
6 - 311
7 - Cake
8 - Dave Matthews Band
9 - The Living End
10 - The Mavericks

I mostly prefer individual artists, but, that's another thread!