Allan Ulrich for SF Chronicle

Choreographers are different from us mere mortals. They hear music and they instinctively imagine bodies in motion. They sometimes find danceable the music that the rest of us perceive as mere sound. Nobody before Mark Morris, to my knowledge, ever attempted a setting of Beethoven's "Ghost" Trio, his Op. 70, No. 1, and nobody, for sure, would have used this ripe Romantic effusion as a calling-card work.