Neville Marriner, Acaemy of St. Marin-in-the-Fields
"Mozart: Sinfonia Concertante K. 364" (Vinyl)

Perhaps its the egalitarian nature of the composition.  Perhaps it's the single-star status of Sir Marriner.  Whatever the reasoning, this is the most subdued presentation of Mozart's 'Sinfonia Concertante' I've seen yet.

You actually have to read the record's label itself to find the name of the two soloists.  In an age where this work is treated as a concerto alongside Mozart's other concerti, to have such a non-descript presentation is surprising at best.

To support this point of view, the musical choices made by these musicians are also rather subdued.  I've heard far more outlandish interpretations of this work.

For the record, the soloists on this performance are Alan Loveday, violin and Stephen Shingles, viola.

I believe this to be a re-release of previously recorded material.  The date on this London LP is 1982, but the recordings themselves date to 1971 and 1973.