I can help you there; it's Halleluja from the album "Grace" by Jeff Buckley.
(also covered by Bono and written by Leonard Cohen if you're interested)

This is a fine example of the music and images fitting together well, even with the sound turned off, the video still works.
I must be frank and say that I'm not "into" wedding videos but I liked the reportage style of the stuff on show and anyone who manages to mix a career with making scripted shorts is worth praise in my book.