1. Bad Time For Bonzo (Captain on vocals)
2. Curtain Call (no vocals)
3. Dozen Girls (instrumental)
4. Dr. Jekyll and Mr Hyde
5. History Of The World (Part 1) (instrumental)
6. Sick Of This And That
Bit of a mixed bag that doesn't match either of the sets of Black Album demos listed on the excellent onewaylove.com site.
Curtain Call seems a pretty late recording - effectively just Dave's vocals missing from the final take; whereas Bad Time and Sick Of This And That are somewhat earlier.
It's Dozen Girls and History Of The World that are the strange ones, both being instrumental versions with Hank Marvin-style guitar replacing the vocals. Hard to see why the band would do this, but given the Captain's fripperies, perhaps not so strange (and they do both sound genuine).