Stravinsky's Catalog Yields Tasty Plums.

The Mostly Mozart Festival's secondary focus on Stravinsky this summer has been a hit, no doubt because the most frequently heard of his works -- the three early ballets, the various incarnations of ''L'Histoire du Soldat'' and ''Pulcinella'' -- have largely been bypassed in favor of worthy scores that are not programmed continuously through the season. The Symphony in C, in fact, was given two outings: Louis Langree and the orchestra dangled it as a coming attraction in a free preview concert a few days before the festival began, and Mr. Langree conducted it again on Friday and Saturday as the first half of a program that it shared with Nelson Freire's performance of the Beethoven Piano Concerto No. 4. The Saturday evening concert at Avery Fisher Hall had a thematically related postlude as well -- an installment of A Little Night Music, the festival's late-night series at the Stanley H. Kaplan Penthouse, in which the pianist Jenny Lin played Mozart and Stravinsky rarities. [ABSTRACT FROM PUBLISHER]