Joseph Gramley and Jonathan Ovalle, directors. This concert will feature Lou Harrison\&##39;s seminal Concerto for Organ with Percussion Orchestra (1973) on Hill\&##39;s unparalleled E. M. Skinner/Æolian-Skinner organ. This rarely heard work was last heard here in Ann Arbor during the San Francisco Symphony\&##39;s American Mavericks festival. Other works on the program include works by John Cage and Lou Harrison (joint composition) Carlos Chavez, Peter Garland and Steven Stucky among others.