1 Death Cab For Cutie vs. Arcade Fire
This is a very difficult choice, but I feel Arcade Fire has done more to advance music than Death Cab.
2 Blur vs. Snow Patrol
I don't know either well enough to vote
3 Radiohead vs. The Beatles
Another tough choice, considering the Beatles are the most imporant band of all time and Radiohead will go down in history as the most important band of all time after the Beatles. As much as I think Radiohead has transformed the meaning of music, it was The Beatles who gave us the modern song.
4 Sigur Rós vs. Keane
No one does good melodic songs the way Keane does. I like the ambient sound Sigur Rós has, but their actual songs could be better.