Pittsburgh is the second-largest city in the Commonwealth of Pennsylvania with a population of 305,841 and the county seat of Allegheny County. Pittsburgh has a rich history in arts and culture dating from 19th century industrialists commissioning and donating public works, such as Heinz Hall for the Performing Arts and the Benedum Center. Pittsburgh has a long tradition of jazz, blues and bluegrass music. Pittsburgh's major art museums include the Andy Warhol Museum, the Carnegie Museum of Art, the Frick Art & Historical Center, Pittsburgh Center for the Arts and the Mattress Factory. The Pittsburgh Zoo and PPG Aquarium, Phipps Conservatory and Botanical Gardens, and the National Aviary have served the city for over a century.