If anyone here knows of Devin Townsend's Ziltoid the Omniscient concept album, he's currently working on the sequel to it and is putting together what he's calling the Universal Choir. In essence, he wants people to record themselves singing certain parts for the upcoming album so he can mix them all together into a stadium-like chorus. Everyone's welcome to participate, even if you can't sing. I personally think it's a really cool opportunity and I'll probably be participating.
More information can be found here as well as in the tweets below.