posted already in an other forum, but what the heck. Thanks to Frank Stöver, I was able to dig out the one and only "unreleased" Hellhammer piece ever recorded (done by Erich Keller in the Rehearsal room in '83)
Tom, Mike Owens=Mike Baum, Bruce Day
and cover (thou made some years later after the Rehearsal from someone outside the band):
Even though the Rehearsal is 25min, it is a constant Revelations Of Doom practice, while in the last 30 seconds they play the song DEMON ENTRAILS. An instrumental one, and as said, only 30 seconds.
And if you understand German you may recognize why Mike Owens wasn't in the band a very long time
The 2nd part of the ZIP file is just 3 more minutes blabla.
Enjoy it !