The newly-formed Mather House string ensemble has an excellent program for Sunday afternoon. If you don't go to hear the Vaughan Williams Fantasy on a Theme of Thomas Tallis, then you certainly should hear the Sammartini Symphony in G--a minor masterpiece of the rpertoire, rarely played.

April Showers and Gerry Moshell lead a recital of chamber music for flute, piano, bassoon, and guitar. Another concert in the Holmes Hall Series which is approaching a Dunster-esque level of activity.

KIRKLAND HOUSE. Quintessence. Chamber music by Bach, Vivaldi, Reineke, Poulenc, Binkerd, Free. Friday, November 16, 8:30 p.m.

KRESGE AUDITORIUM (MIT). MIT Symphony Orchestra. Mozart: Figaro overture; Prokofiev: Piano Concerto No. 3 (Yasuo Watanabe, soloist); Sibelius: Symphony No. 2. Tickets: $1. Saturday, November 17, 8:30 p.m.

SANDERS THEATER. Bach Society Orchestra. All-Mozart program: Figaro overture, Eine Kleine Nachtmusik, Symphony No. 35, Oboe Concerto in C (Stephen Hammer, soloist). Tickets: $.95. Saturday, November 17, Midnight.

MATHER HOUSE DINING ROOM. I Solisti di Mather. Works for string orchestra conducted by Michael Harris. Hindemith, Vaughan Williams, Grieg, Sammartini. Free. Sunday, November 18, 2:00 p.m.