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A question came in that wondered if the descant horn can play an octave higher than a standard double horn, with the implication that maybe it would easily play higher than a standard horn.
Unfortunately, a descant horn has basically the same range as a standard double horn. You can play just as high and just as low on a double descant as on a standard double horn. The primary advantage of the descant is better accuracy in the high range. I have more on the descant horn here. It is a great instrument for works of a lighter character in the high range.
I have had this type of question come in from composers several times actually. My note to them would be that if you want to write an octave above a standard horn please consider trumpet or Flugelhorn instead of horn. I would not suggest writing above written high C (horn in F) for any type of horn unless you are working with a specific player who is able to play higher with ease. Most professional hornists can play a note or two above high C but that range is quite difficult to produce for many players, especially in a concert situation. The highest note in any standard work is a written E above the staff (horn in F) and the vast majority of pros would I am sure rather not play that high in a public performance.
