It was good to have Beethoven back, last week at the San Francisco Symphony. Marek Janowski, like Kurt Masur before him, brings the German repertory to San Francisco from an authentic sensibility and a lifetime of devotion. It was a pleasure to hear our orchestra — so vibrant in Mahler, American music and the Russians — snap back into the German sonority on cue and play convincingly the music that most groups once considered their bread and butter.