There's a remix from one of the master reels....it runs seven minutes, and something.... It came on the same master reel CD as Cecelia, though I somehow doubt these were on the same reel-to-reel tape. Anyhow, it is very percussion-y, but does feature vocals. This may be the version in question, even though it's not 10 minutes.
I have posted it with You Send It.com, and if interested, you may download it here for a limited time:
http://s21.yousendit.com/d.aspx?id=0...O38HVFQ4SB6D0R