 There are special classical music halls like the Bochumer Symphoniker, the Duisburg Mercatorhalle, the Saalbau Essen or the Dortmunder Philharmoniker.Each year in spring time, there is the Klavier-Festival Ruhr in the Ruhr area with 50 to 80 events of classical and jazz music.With more than 50 museums, Ruhr has one of the largest variety of museums in Europe.