Awesome! Ten stars for real. Upload the full work.
:blink:
C Trumpet is a *non-transposing* instrument. If the composer wants C Trumpets, then they're written in concert pitch. Sometimes if the part is in Bb and no Bb instrument is available (and vice versa), then the players will transpose on the fly. This is especially true with F Trumpet parts of old where one would have to transpose up a 5th (on a Bb Trumpet).
There's debate actually that it may be *easier* to play in the upper register on the Bb Trumpet because of the larger tubing. That's one of the reasons Bb is used in Jazz bands. Though the difference is slight at best and not of concern to the average composer.
Everything here is mostly right. Orchestras nowadays typically use Cs, but Bbs are far from unusual. They're basically the same deal as far as the composer is concerned. C trumpet is slightly (very slightly) more vibrant and brilliant. C trumpet is a concert pitch instrument, there is no transposition in the part or in the playing.
Bb trumpets are used in Jazz bands because of tradition. The C trumpet is a higher trumpet and is actually easier to play higher notes with. That's a non-issue in this case.
There is no issue with transposing. It's kinda like setting your keyboard to transpose up two semitones.
But Cs do blow differently and have some different recommended fingerings than the Bbs. It's not like a Bb player who's never played one before can pick a C up and play with the same facility. He'd play quite a few notes out of tune and would probably be out of sorts readjusting his ear to hear "C" being a whole step higher than he's used to.
[edit] I don't like to do things like this, but I have to ask:
who is it that puts a dock on my "reputation" half the time I chime in on trumpet stuff? I am a teacher and professional trumpet player, guys. I'm listing pure facts, here. If you have a problem with what I'm saying, grow up and tell it to my face instead of taking anonymous potshots.
It's all in the spirit of music. Nameless poo-pooing ain't.