SATURDAY NIGHT'S San Francisco Symphony subscription concert in Davies Hall will be preceded at 5:30 by a free musical event that is both warm tribute and sad farewell. Former symphony associate concertmaster Jorja Fleezanis will host and perform at a memorial to her late husband, music historian and unparalleled program annotator Michael Steinberg, who died in July at age 80.

Steinberg, whose witty, informative and thoroughly engaging commentary graced the symphony's printed programs for more than three decades, will be honored in shared personal remembrances of symphony musicians and friends, including solo pianist Garrick Ohlsson, keyboard principal Robin Sutherland, principal oboist William Bennett and others. Among the musical selections will be a chamber version of the Adagietto from Mahler's Fifth Symphony and the Largo e mesto movement from Beethoven's Piano Sonata No. 7.

Following the tribute, expected to last about an hour, Michael Tilson Thomas returns with the full orchestra at 8 p.m. to perform S.F. Symphony's first accounting of Charles Ives' "Concord Symphony." The orchestra and the Symphony Chorus also will perform the Schubert Mass No. 2 with soprano Leah Crocetto, tenor Thomas Cooley and bass-baritone Patrick Carfizzi as vocal soloists.

Another performance of the subscription concert takes place at 8 tonight in Davies Hall. Tickets, at $35-$135, are available at 415-864-6000 or