Performer: Robert Rosenwasser

A projection of green sky above shadowy mountains hovered behind their duet, and the curved bodies of the other dancers moved, barely visible, in the darkness of downstage.

This fall, Alonzo King puts his sleek, sinuous stamp on Bach’s Double Violin Concerto, with witty nods to predecessors George Balanchine and Paul Taylor who, in 1941 and 1975 respectively, created two towering classics of dance to the same piece of music.