Works by W A Mozart seem to have been used as a "template" by at least two of our "unsungs". Spohr appears to have based his Alruna Overture on the Magic Flute Overture, whilst the finale of Josef Netzer's First Symphony appears to owe quite a lot in its general form to that of Mozart's so call "Jupiter" Symphony in the same key of C major. I wonder if there are other similar "borrowings" of musical frameworks by other unsung composers.