Does anyone know who is singing the sound track Desire????

Azza, that is Ryan Adams singing "Desire." Great song, isn't it?

You can find any answers to your "House" music questions on this site:

http://www.have-dog-come/house

Other site that is loaded with information about the show is:

http://www.housemd-guide.com

On that last one, check out all the little tabs across the top. The "Resources" one is the one that guided me to the answer for your music question.

Warning: Don't go to that site unless you have HOURS to spend on the computer. It's addictive!!!