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This is a most compelling multi-channel recording.
Not only the interpretation and the singing are top-notch (imho), the booklet explains in detail how the work was performed in that Leipzig church under Bach's own setup (the technical and the artistic reasons): the 2 organs and the double choir were not organized into front left-and-right like most performances nowadays, but into front-and-back. The main orchestra, the first choir and the main organ in front of the audience, and a small orchestra, the second choir, and the second organ at the back. This multi-channel recording aims to reproduce Bach's performance setting in Leipzig.
I believe the SACD is out of print, but there may be some available in the secondary market such as ebay.