I am currently obsessed with this song...
In big screen comic adaptation Scott Pilgrim vs. The World, The Clash At Demonhead are the big rock stars of this particular universe. So it makes sense for lead singer Envy Adams (played by actress-singer-songwriter Brie Larson) to let rip with one of the catchiest songs of the entire movie.
Larson performs the song Black Sheep in the film, although the original version of the track - by the Canadian indie-alternative band Metric - appears on the film's soundtrack. Either way, it's a frikken awesome song! Plus, and this is most unlike me, I LOVE Envy's shoes in the music video.
Oops, by the looks of things, the music video above cuts off before the end. You can watch the entire, unembeddable track here on YouTube.