If it's the concert I'm thinking of from the 70's, it has an all-star lineup but is really very underwhelming artistically, much much less than the sum of its parts. grossly underrehearsed and not well thought out, like so many of the things from that period. There is a lot of gold from that era, but also a lot of dross. I heard this one again recently, and it sounded like dross then and sounds like dross now. Save your money. Make sure you have 'The Free Slave' by Brooks, from a couple of years before. That one, originally on Muse and reissued on CD on 32Jazz, is a gem.
Thanks for the insight. I will check out 'The Free Slave' first.