CLASSICAL CONCERTS Wednesday 8/23 Bach Celebration Baroque violinist Cynthia Roberts performs ...

Bach Celebration

Baroque violinist Cynthia Roberts performs Johann Sebastian's Complete Sonatas for Violin & Obbligato Harpsichord feat. harpsichordist James Richman; North Plaza, W. 65th St. (betw. B'way & Amsterdam Ave.), 212-875-5108; 6, free.

Colorado String Quartet

Ensemble performs last of five all-Haydn programs; Walter Reade Theater at Lincoln Center, 165 W. 65th St. (B'way), 212-721-6500; 6, $15.

Mostly Mozart Festival Orchestra

Gerard Schwarz conducts works by Mozart, Mendelssohn & Bizet feat. violinist Pamela Frank & pianist Till Fellner; Avery Fisher Hall, 10 Lincoln Center Plaza, B'way (64th St.), 212-721-6500; 8, $25-$45.

Thursday 8/24

Westside Opera

Roger Malouf conducts Mozart's Zaide; Trinity Church, B'way (Wall St.), 212-602-0747; 1, free.

Locrian Chamber Players

Ensemble performs works by Riley, Glass, Benkas, Wong, Macdonald, Faiman & Sullivan; Christ Chapel, Riverside Church, 91 Claremont Ave. (120th St.), 212-662-8322; 8, $10, $8 st./s.c.

New London Consort

Philip Pickett directs baroque ensemble in J.S. Bach's Suites 1-4; Alice Tully Hall, 1941 B'way (65th St.), 212-721-6500; 8, $35.

Friday 8/25

Mostly Mozart Festival Orchestra

Gerard Schwarz conducts works by Mozart & Weber feat. Riverside Choral Society; Avery Fisher Hall, 10 Lincoln Center Plaza, B'way (64th St.), 212-721-6500; 8, $20-$40 [repeats Sat.].

Sunday 8/27

Men of St. Bartholomew's Choir

William Trafka conducts Durufle's Messe "Cum Jiblo"; St. Bartholomew's Church, 109 E. 50th St. (Park Ave.), 212-378-0248; 11 a.m., contrib.

Tuesday 8/29

Juilliard Artists In Concert

Clarinetist Alexander Fiterstein, violinist Naho Nauyki & pianist Steven Beck perform works by Khachaturian, Kreisler, Kupferman & Bartok; Continental Center, 180 Maiden Ln. (Front St.), 212-799-5000; 12:30, free.