Carl Nielsen is generally considered to be Denmark's greatest composer. His works cover the full range of musical genres: symphonies and operas, chamber music, pieces for piano, and songs. Whereas in Denmark Carl Nielsen is especially loved for his Danish songs and the opera Maskarade, internationally he is primarily known for his instrumental music. Collecting, cataloguing and organising the musical manuscripts of this composer has been carried out for the benefit of the Danish and international music community.