Thought I'd post a couple of links to videos on youtube of David Bowie fronting The Arcade Fire at something that I think is called Fashion Rocks. First link is Bowie fronting the band for an ispirational version of Wake Up;
http://www.youtube.com/watch?v=S0Ff8dd5iV0
Next link is to a great rendition of Five Years again Bowie and Arcade Fire. Fantastic stuff in my opinion.
http://www.youtube.com/watch?v=EkCc_qiI7UA