Chick Corea, piano and wurlitzer piano
John McLaughlin, guitar
Dave Holland, bass
Jack DeJohnette, drums
All the information given here is sketchy and second hand.
There are some major contradictions regarding the information that came with this tape most notably the fact that McLaughlin didn't come to America until February 1969.
It's McLaughlin and the place is New York so it's probably late APRIL or early MAY 1969
Attached is a scan of a John McLaughlin Melody Maker interview published April 19 - 1969 where he mentions he has learnt more in the past 6 weeks (it would appear this interview was late in March 1969) he also mentions a FUTURE recording session with Corea, Holland, DeJohnette ......... he does not mention Tony Williams Lifetime yet having a recording contract (they recorded 'Emergency' late May 1969) so this session time was probably donated by Miles Davis and took place April/May 1969.
Note that Corea with Holland and DeJohnette, but not McLaughlin recorded the album Is in NYC on the dates May 11-13 1969.
Yeah this is another goodie that I had on the harddisc for over 2 years, and I bet that I don't need to say it fantastic indeed.