CLASSICAL

THURSDAY Busch-Reisinger Recital Series--noon--Kirkland St., Cambridge-- Brian Jones, organ. Free. Lecture-Demonstration on the University Organ--10:30 am--Appleton Chapel, Memoral Church-- John

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THURSDAY

Busch-Reisinger Recital Series--noon--Kirkland St., Cambridge--Brian Jones, organ. Free.

Lecture-Demonstration on the University Organ--10:30 am--Appleton Chapel, Memoral Church--John Ferris, University Organist and Choirmaster.

Community Music Center of Boston--8 pm--48 Warren St., Boston--Bridgetower String Quartet performs works of Mozart, Ravel, and Brahms. Free. Info 482-7494.

Festival of Contemporary Music--2 pm--Jordan Hall, Boston--The Purcell String Quartet and the New York New Music Ensemble--program of contemporary composers Fodi, Exton, Mendoza, Merilainen, and Hegdal. Info 262-0122.

FRIDAY

Radcliffe Pitches Halloween Concert--8:30 pm--Lowell House Dining Room--also featuring Harvard Krokodiloes, groups from Williams and Dartmouth. Tickets $1.50.

Harvard University Band--8:30 pm--Sanders Theater--music by the Concert, Jazz, and Marching Bands.

Boston University Celebrity Series--8:30 pm--Jordan Hall, Boston--Julliard String Quartet. Info 482-2595.

Boston Musica Viva--2 pm--Jordan Hall, Boston--Richard Pittman conducts program of works by American composers.

Festival of Contemporary Music--8:30 pm--Kresge Auditorium, MIT--program of electronic music. Info 262-0122.

Dunster House Music Society--5:30 pm--Library--Elfrieda Hiebert, piano--Waltzes and Intermezzi of Brahms. Free.

SATURDAY

Dunster House Music Society--5:30 pm--Library--Heidi Peterson, recorder and baroque flute, Gaylen Alford, gamba, and Kathryn Patrikis, harpsichord--works of Veracini, Boismortier, Rameau, and Telemann. Free.

Musica Orbis--8:30 pm--Sanders Theater--it's pretty hard to describe, but 5 people play a bunch of instruments. Tickets $2.50 and $3.50.

Festival of Contemporary Music--2 pm--Jordan Hall, Boston--Collage and the New York String Quartet--program of contemporary composers Qwilich, Laderman, Druckman, Sur, and Monod. Info 262-0122.

Festival of Contemporary Music--8:30 pm--Jordan Hall, Boston--New England Conservatory Symphony Orchestra under Gunther Schuller. Info 262-0122.

MONDAY

Fromm Music Foundation--8:30 pm--Sanders Theater--The Pro Arte String Quartet, assisted by Richard Kogan, piano, Scott Nickrenz, viola, and Beverly Morgan, soprano--works of Bassett, Cruckman, and Imbrie. Free.