If "Hallelujah" is one of those songs that you can't hear without your heart feeling just a little bit heavier, you're going to want to see this video. As part of the Luminato Festival, Toronto's Choir! Choir! Choir! singing group invited Rufus Wainwright to lead a chorus of 1,500 singers in a rendition of Leonard Cohen's classic. (You may be more familiar with Jeff Buckley's version [1].) You really just need to watch the video — it's powerful.