The concert began with a curiously monochromatic rendering of Wolfgang Amadeus Mozart's Viola Quintet No. 3 in C Major, K. 515. This is not one of Mozart's most gripping compositions, to be honest, resulting from a financial crisis he tried to resolve by selling his compositions to the highest bidder. The title itself is unusual: there are not many viola quintets on the market now and were not many in 1788.
That said, the performance, by Perlman and Sussmann, violins; Ferguson and Andrew Gonzalez, violas; and Katz on cello, was expert.