Who drives four hours to see a concert? I do. When I first read about the Pittsburgh Symphony looking for a few good pooches to audition for an upcoming performance, I was there. The dogs were needed to round out Leopold Mozart’s (Wolfgang’s, or should I say Woofgang’s — father) “Hunting Horn Symphony,” which calls for barking to accompany the horn soloists. Even better: The world-class event was free, courtesy of the city’s annual spring outdoor arts festival at a great spot: Point State Park, where three rivers meet. I had the pleasure of meeting one of the stars prior to the performance: Sergeant Preston. His owner told me he was rescued off the streets of Houston, where she lived before moving to Pittsburgh. She works for the symphony, but insists there was no nepotism involved — his ability and strong stage presence blew everyone away at the audition. In case you were wondering like I was, he was named for a character in a '50s radio, and then TV show — "Sergeant Preston of the Yukon." His owner tells me that name meshed well with that of her other rescue dog, Nanook of the North. The performers took their places. And they didn't disappoint. The crowd gave it a resounding four paws.