This time it's the Feb 23, 1969 'Rockpile' concert.
- frank zappa & the mothers of invention: bacon fat - live at the rockpile '69
(2017, cd, uk, keyhole)
A recording of this concert can be found over at the Zappateers website.
And that very same recording is most likely the source for this CD as well.
-- info: Danny Mathys