Unless I simply have not found it in the wealth of information in UC, nobody has yet started a list/discussion of unsung composers who wrote just one symphony. I recently listened to a CD again that I had almost forgotten I had - and I thought the only symphony by André Messager (written when he was 22) was actually quite a charming work that merits repeated listening. It is on a Skarbo CD (SK3921), a live recording from 1992 played by the Orchestre Symphonique du Mans conducted by José-André Gendille and probably long since deleted. The couplings are the Allegro Symphonique by Fauré and the Variations Symphoniques by Franck. Does anyone else know this work? I'll also be curious to see what other single-symphony composers UC members come up with.