You can download it here (both are live):
http://u2world.w.interia.pl/mp3/charlotte.html (really cool)
http://www.115bourbonstreet.com/band_information.asp?BandID=2 (this isn't so good)
Please notice that it's recorded from a concert, and what you here on the film is the intro to the original song. It's pretty cool though.