Bob, each to his/her own. I wouldn't play a Mozart on any horn other than what I have, and I don't remember him ever composing much for any horn. He was almost exclusively a keyboard composer. It is subsequent arrangers that have scored his music for full orchestras. Although the great classical composers provide many skill development studies, they now aren't in that much demand or current money makers. IMO Mozart's Turkish March outdoes Beethoven's and both are in my repertoire for my multi-horns, as they were for my Mother's piano from which I transposed the music. I knew a young boy who wanted to play trumpet, and though I was not then tutoring him, he sorted through my music collection and found Mozart's "Concert Rondo" scored for trumpet and piano accompaniment and began to play it on then Band Now trumpet as was in really bad condition. I lent him one of mine, and he played it well enough that I arranged for piano accompaniment and he performed it at the Senior Center. He's now moved to GA and has a new Bach Strad and a private tutor. This boy could read music as well as I, and such from singing in church children's choirs although his family life had once been a horror story.