I was immediately going to reply Mumford & Sons, The Black Keys, and Silversun Pickups, but then I see this, lol. Nice taste in music!
I would add:
Sleigh Bells
Arctic Monkeys
Foo Fighters
Coheed & Cambria
Bloc Party
A Day To Remember
Incubus
Minus The Bear
Rise Against
The Smashing Pumpkins