Principal Guest Conductor talks about conducting the PSO in the orchestral world premiere of Scott Eyerly's "Arlington Sons," written for father-and-son singers David and Robert Pittsinger, inspired by a Pittsinger patriarch's service guarding the Tomb of the Unknown at Arlington Cemetery. Slatkin also talks about Olga Kern's special gift with Rachmaninoff's piano Concerto #3, the Symphony #3 by American composer William Schuman, and Slatkin's newly-published book, "Conducting Business."