1. Locate the written notes: Read through the music you wish to transpose and identify the notes written for the trumpet.
2. Determine the key: Identify the key of the original music.
3. Count the half-steps: Starting from the key tone (the first note of the scale), count upwards (for sharps) or downwards (for flats) to see how many half-steps separate the written trumpet note and the note you wish to transpose to on the French horn.
4. Apply transpositions:
Trumpet in B-flat to French Horn in F transposition: For notes written for the B-flat trumpet, go down one whole tone (two half-steps). For example, if the written trumpet note is "C," you will transpose it down to "B-flat" for the French horn.
Trumpet in C to French Horn in F transposition: For notes written for the C trumpet, go up a perfect fifth (seven half-steps). For instance, if the written trumpet note is "G," you will transpose it up to "D" for the French horn.
5. Repitch music: Repitch the written music according to the transpositions you have determined.
Here's a comparison table to assist in the transpositions:
| Original Trumpet Note | Transposed French Horn Note |
|---|---|
| B-flat | A |
| C | B-flat |
| C-sharp | C |
| D | C-sharp |
| D-sharp | D |
| E | E |
| F | E |
| F-sharp | F |
| G | G |
Remember that this guide provides basic transposition guidelines, and some nuances may vary depending on the specific composition or requirements. It is always a good idea to check the final transpositions with a professional musician or conductor before performing the transposed piece.