The season is the Year of the Listener. Robert Weirich conducts two Saturday orchestra concerts, one a program of symphonic jazz with Jean Kopperud as soloist in Bernstein’s Prelude, Fugue and Riffs for Clarinet and Jazz Ensemble. Julie Newell, soprano, and Patrick Mason, baritone, sing Bernstein’s Arias and Barcarolles with Kwang-Wu Kim and Robert Weirich, piano four-hands. George Rochberg introduces his Sonata-Aria and Piano Trio No. 3. In his 13th appearance in 14 years, Paul Hersh plays piano in Dvořák’s Piano Quartet in E-flat and Mozart’s Piano Trio in E-flat, K. 498, and viola in Tchaikovsky’s Souvenir de Florence. Chester Biscardi’s Tango for clarinet, horn, violin, cello, piano, and percussion receives its first performance. Hilary Hahn plays a Schubert sonata with pianist Dana Burnett; Mozart’s Clarinet Quintet in A Major with Deborah Chodacki, clarinet; and Spohr’s Violin Concerto No. 8, David Zinman conducting.