OFF: Blues tape

[J Strobridge]

Talking to a friend in the pub the other night and he was telling me of
a cassette tape that was issued in the mid 70s(?) consisting of outtakes
and sound checks by various blues/rock guitar players such as Eric
Clapton, Peter Green  ummmm - others (I forget who now!).   Apparently
this was a genuine commercial release that someone had put together in
a recording studio with these guys who just happened to be in the studio
together and jamming around while they were doing soundchecks before
their various recording sessions.    I don't know if it was ever issued
on vinyl but I was wondering if anyone here (by some remote chance)
either recognised what this was or knew of a place I could ask about it.

Since it was a commercial release and not a bootleg I guess there
should have been/still be copies around for purchase.   Apparently it
was a wonderful sounding tape with all these guys playing a really laid
back and relaxed sound - can anyone suggest a place to look?

ta
jill
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J.D.Strobridge at ed.ac.uk                         eset08 at holyrood.ed.ac.uk
                                                ELIJSA at srv0.arts.ed.ac.uk
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