I need more songs.

I should be getting a 16gb iPod Touch pretty soon (or Christmas x_x) and I have like, 20 songs on my computer, and I wanna fill this baby up.

My type of music is like... here's a list of the bands/artists that I currently like, then can people give me a list of music which are like them? :3

3OH!3
The Killers
N*E*R*D
Katy Perry (lol)
Basshunter
Noah and the Whales
The Ting Tings
The Offspring
Queen
Muse
Gym Class Heroes


Thanks.