Wow, looking at the lists of musicians/bands here, I am disappointed that my music range is extremely limited. I only recognised 2-3 artists from everyone's list.
For me, I'm a huge fan of alternative rock, bossa nova and a little bit o' jazz. But I do listen to pop too, it's my guilty pleasure.
My all-time favourite alt. Rock band is Coldplay, although I'm not keen on their recent stuff like ghost stories. It's too much pop. I am forever in love with their album Parachutes though.
alt. Rock: Coldplay, Onerepublic, Imagine Dragons, Sugar Ray, The Script (this one's more of Pop rock), and Sum 41 are some that I can remember from the top of my head.
Bossa Nova: Marcela Mangabeira, Stacey Kent and Olivia Ong to name a few.
Jazz: Norah Jones, Ella Fitzgerald, Dianna Krall and Nat King Cole.
Some others that I'm fond of are: Feist, Adele, Hoobastank, Avril's earlier music, sixpencenonethericher, The Corrs, Jason Mraz. Heck I think even Lorde's music is quite cool. And of course, Queen. :)