Louis Vierne composed six symphonies for the organ in total:
Organ Symphony No. 1 (Vierne) in D minor Organ Symphony No. 2 (Vierne) in E minor Organ Symphony No. 3 (Vierne) in F-sharp minor Organ Symphony No. 4 (Vierne) in G minor Organ Symphony No. 5 (Vierne) in A minor Organ Symphony No. 6 (Vierne) in B minor