Tuesday through Saturday of next week, August 7 through 11, the Mark Morris Dance Group will reprise Looky, the dance Mark choreographed to my Disklavier studies, at the summer dance festival at Jacob’s Pillow in the town of Becket, in western Massachusetts. Other pieces on the concert employ music by Bach, Brahms, and Stravinsky. Mark’s dances are incredibly beautiful, and, as his reputation attests, intimately derived from the music he chooses.