Ridehuset, once a riding stable on the Akershus fortress, is now the permanent rehearsal and concert arena for Forsvarets stabsmusikkorps. Ridehuset is today a modern, stylish concert house tailored to the needs of Stabsmusikken. The house holds a large stage, wardrobes, a music library, storage facilities and seating for 200–250 people. Due in part to the excellent acoustics, Ridehuset has become a very popular arena for other ensembles in Oslo. The Oslo Philharmonic Orchestra, Oslo Sinfonietta and the Ultima festival, among others, held concerts in Ridehuset during the 2008/09 season.