 The reason for this is that most of Monn's compositions only survive in copies from the 1780s and could therefore also be the works of his younger brother.There is no absolute proof that the Johann Georg Mann is the same person as the "Georg Matthias Monn" who died in 1750.His role as pioneer of the symphony is a scholarly image, coined in the early 20th century, and could need some basic musicological reevaluation.