19. Mystery Jets - Two Doors Down
At the start of this year, Mystery Jets to me were just another faceless indie band interchangable with the Wombats, Automatic, Arctic Monkeys and We Are Scientists. Then I accidentally saw them live not once but twice over the summer, and found that they are actually quite enjoyable.
My rules for this list state no more than one appearance by any one artist. Because of this I can't post the duet "Young Love", as Laura Marling appears later on in a higher positioned song, so I've gone for the cheerful, catchier than syphilis, "Two Doors Down".