M.I.T. CHAPEL--Commonwealth Chamber Players. Woodwind quintets by Danzi, Reicha. Free. Thursday, February 14, 12 noon.

NATIONAL THEATER/Boston Center for the Arts--Vaughan Williams opera Riders to the Sea; William Walton's extravaganza The Bear. Thursday and Saturday, February 14 and 16, 8 p.m. Call 542-0308 for tickets.

HOLMES HALL--Harvard Music Department Performance Seminar. Chamber music of Mozart, Berg, Sessions. Free. Thursday, February 14, 8:30 p.m.

KIRKLAND JCR--Joel Moerschel, cello; Neal Larrabee, piano. Sonatas by Beethoven, Chopin, Debussy, Kodaly, Ginastera. Free. Friday, February 15, 8:30 p.m.

CURRIER SCR--Erica Klemperer, violinist, in recital, Music of Beethoven, Dvorak, Bach, Ravel, Smetana. Free. Sunday, February 17, 3:00 p.m.

DUNSTER LIBRARY--Fine Arts Trio. Piano trios of Mendelssohn and Brahms. Free. Sunday, February 17, 3:00 p.m.

SANDERS THEATER--Cantata Singers. Bach: Cantatas Nos. 27, 125; Schoenberg: Dreimal tausend Jahre; Sweelinck: Huguenot Psalms. $5-$1. Wednesday, February 20, 8:30 p.m.