 It is not known why.It can be noted, however, that the symphony is one of only two he wrote (the "Unfinished" Symphony is the other) in a minor key.The scoring is for 2 flutes, 2 oboes, 2 clarinets in B♭, 2 bassoons, 4 horns in A♭, C and E♭, 2 trumpets in C and E♭, timpani and strings.