I have 51 "officially recorded" songs by The Fratellis (2 albums + all the B-Sides) plus Live DVDs, Sessions etc so like I have 100's of tracks.

All the Radiohead albums, Muse, Rage Against The Machine, Franz Ferdinand (+ alot of B-Sides), All-American Rejects, Arctic Monkeys (+ B-Sides), Billy Talent, Bowling For Soup, The Charlatans, Fall Out Boy, Green Day, Kaiser Chiefs, The Killers, Kings of Leon, My Chemical Romance (ugh), Lostprophets, System of a Down, Simple Plan, Sum 41, Weezer and Wheatus.

I tend to collect more than 1 album by an artist, and some I just get all of them!