Help me identify this alternative/indie music video?

I got it on iTunes for free, once, and now I can’t remember what it is or who it’s by. I remember that it was sung by a girl and it took place in a school that was very gray and dingy looking.

The video was stop motion and all the people (mostly elderly folks) were climbing over objects and going up and down stairs, and there were two girls holding hands who were dressed in black that would tilt their heads to the beat once in awhile.

Anyone have any ideas?