BUSCH-REISINGER MUSEUM. Herbert Burtis, organist, in recital. Free Thursday, May 17, 12:15 p.m.

LONGY SCHOOL OF MUSIC. Chamber music recital. Free. Friday, May 18, 8:30 p.m.

ELIOT LIBRARY. Baroque chamber music for flute, viola da gamba, and harpsichord. Works of C.P.E. Bach, Rameau, and Marais. Free. Saturday, May 19, 8:30 p.m.

LOEB DRAMA CENTER. New music for the theater by Harvard composers Earl Kim and Fred Lerdahl. Free. Sat. and Sun., May 19-20, 8:30 p.m.

FIRST CHURCH, CONGREGATIONAL (Garden St.). Quadrivium Collegium, directed by Marleen Montgomery, in a program of medieval, renaissance, and early American music. Tickets: $3 (students: $2). Sat., May 19, 8:30 p.m.; same program at Emmanuel Church (15 Newbury St., Boston) Sunday, May 20, 8:30 p.m.


ORPHEUM THEATER. Opera company of Boston present Verdi's Don Carlos in the original French version. Tickets: 267-8050. Sunday and Tuesday, May 20 and 22, 7:00 p.m.

EPISCOPAL THEOLOGICAL SEMINARY. John Ferris, University Organist, playing works of Bach and Franck. Free. Wednesday, May 23, 5:25 p.m. following Evensong.

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