That looks very interesting and could be awesome in Quad. Pergolesi’s Missa Romana is for 2 or 4 choirs. If it‘s 4 choirs, the Quad recording might have one in each corner. Even if it’s 2 choirs, they might be separated in the front and rear channels. I believe the back of the album sleeve says 2 choirs and soloists. The photo shows the performers in a typical arrangement together in front of the stage, so it is difficult to determine whether they tried to make a discrete surround mix or only an ambient one. At any rate, Pergolesi’s Missa for 4 choirs certainly is a prime candidate for a surround recording.
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I found an old review of the LP version. Scroll down to pages 110 and 111.
https://worldradiohistory.com/Archi...iFI-Stereo/70s/HiFi-Stereo-Review-1974-01.pdf
The reviewer doesn’t mention the Quad mix, which is a pity because elsewhere the magazine is full of information about Quad. There is even a discussion of the 70s oil shortage having an impact on sourcing PVC for records, especially Quad. (On page 54).
There is an nice selection of delicacies from the Baroque and even Renaissance eras. About the surround mix, though, my hunch is that they are mostly ambient. I would love to be proved wrong.
