These are the book of mormon demos sung by Trey Parker, Robert Lopez, and others. There are two pages of these i hope you guys enjoy. http://soundcloud.com/tbomdemos
Wow, "H-E-Double-Hockey-Sticks" is way funnier than "Spooky Mormon Hell Dream" - which was my least favorite part of the show when I saw it in previews.
The most interesting thing to me, and this is probably esoteric to most of the posters, is the original title to "Hasa Diga Ebowai" -- namely, "Vasa Diga Elohai." It's not the "Vasa" or even the "Diga," but how eerily close "Elohai" is to the Hebrew term "Elohim," which is sometimes used in the Old Testament to refer to God. I wonder if the reference was deliberate or not.