My list is pretty long, and spans pretty much everything from heavy metal to pop.
My favorites (aside from Mika)
Queen, Judas Priest, Led Zeppelin, Nightwish, Queensryche, The Beatles(together and solo), Boston, Journey, Maroon 5, Franz Ferdinand, Jason Mraz, Ours, Jeff Buckley, Queens of the Stone Age, Muse, The Killers, Wolfmother.
Those are the ones I listen to the most.