Listen to the concert preview. The second program of the BSO's two-week Brahms mini-fest encompassing Brahms's symphonies and piano concertos opens with a brief new work commissioned from the Brooklyn-based American composer Timo Andres (the first program having included a new work by American composer Eric Nathan). Andres's new piece opens this week's programs, which feature Hélène Grimaud as soloist in Brahms's magisterial Piano Concerto No. 2. The Third Symphony concludes the concerts of November 15 and 17; the Fourth Symphony completes the concerts of November 18 and 19.