What is the best way to transpose a french horn part into a trumpet part?
Q: We are doing a Greensleeves arrangement and I have a french horn part but we have a trumpet player. What do we need to do to make the music playable for the trumpet from the french horn part.
A: Is his instrument a C instrument or a Bb instrument?
The French horn part is written a perfect fifth higher than the sounding pitch.
A Bb trumpet part is written a major second higher than the sounding pitch.
A C trumpet part is written as it sounds.
Transpose down a perfect fourth for a Bb trumpet or down a perfect fifth for a C trumpet.

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Trumpet in B flat - the music needs to be written only a major 2nd higher than concert pitch.
Transpose the music down a perfect 4th or up a perfect 5th depending upon which register of the trumpet your instrumentalist is most comfortable with.