Awesome! I'm not alone in thinking it's perhaps the jewel of the Pentatone Deutsche Grammophon remasterings. Kind of crazy to think that they made a quad master of every recording they made from 1970-1976 (some 400+ records), and none ever saw the light of day except for a few test pressings. And the recordings they made in Boston in particular are quite adventurous with the use of discrete information in the rear channels.
So is that a Thomas Mowery mix in quad ?
You might say he's the Elliot Scheiner of Classical music .