Niels Viggo Bentzon's enormous musical output has long since resulted in a catalogue of legendary dimensions. The main emphasis is in instrumental music, especially music for and with piano, and the forth Piano Concerto is one of the major of this kind. With a whole 24 symphonies spread over more than five decades, Bentzon moreover has a prominent position among Danish symphonists, and both his Fifth and Sixth Symphonies are contemporary Danish classics in the genre.