III Menuetto: Allegro molto (Scherzo) - Trio
Treble, bass (old notation)
C, 3/4, 2/4
Horn 1: g - a2
Horn 2: f# - g2
Horn 3: B - b1
The arrangement presents more challenges the original horn trios of the time (having been limited to the natural harmonics up until then, and not moving away from that style for still some time to come). The opening Allegro has many runs and turns unfamiliar to the non-scale-practicing hornist, mainly in the first part, but also some in the third. Interestingly there are none in the second horn.
In general the second horn seems to have gotten away easy, with with little challenge in either of the movements, not even the third (all the while the first horn plays triplets in a presto 2/4). The range distribution is standard, with the 1st horn leading all the way through, the 2nd horn in the middle tessitura, and the 3rd horn in the low register. There are only few instances of bass clef though (as it only reaches B), so a lot of leger lines reading is required.
Overall a fascinating arrangement, with some more challenges than a classical trio might be used to, but that is only a positive. You can not go wrong with more Beethoven for the horn.