Pittsburgh Symphony music director designate Manfred Honeck is photographed through a small cutout in a door backstage as he conducts the PSO on Thursday evening, September 6, 2007 at Heinz Hall. The annual Pittsburgh Symphony preview concert is an invitation-only run-through of snippets from upcoming programs. But the Heinz Hall audience got a prelude of the future as Honeck stepped in to conduct Johann Strauss Jr.'s "Voices of Spring Waltz."