List of organ symphonies
An organ symphony is a piece for solo pipe organ in various movements. It is a symphonic genre, not so much in musical form (in which it is more similar to the organ sonata or suite), but in imitating orchestral tone color, texture, and symphonic process. Though the very first organ symphony was written by German composer Wilhelm Valentin Volckmar in 1867, the genre is mainly associated with French romanticism. César Franck wrote what is considered to be the first French organ symphony in his "Grande Pièce Symphonique", and the composers Charles-Marie Widor, who wrote  ten organ symphonies, and his pupil Louis Vierne, who wrote six, continued to cultivate the genre. Modern composers such as Jean Guillou have written organ symphonies as well. The genre is considered to have been brought to fruition in the second organ symphony of André Fleury. The term "organ symphony" is also used occasionally to refer to refer to orchestral symphonies with a prominent solo role for an organ (as distinct from an Organ Concerto). The best known examples of such pieces are Saint-Saens' Symphony No. 3 and the Symphony for Organ and Orchestra by Aaron Copland, though strictly  speaking such pieces are closer in form to orchestral symphonies than to the solo organ works described above. This page lists the best known symphonies for solo pipe organ and symphonies for orchestra and organ. Organ concertos (such as those by George Frideric Handel, Francis Poulenc, and David Briggs) are not listed here; neither are orchestral symphonies featuring calling for organ where the organ does not have a prominent solo part (such as those by Gustav Mahler or Arnold Bax).