A trumpet's C and a baritone's might not sound the same.
The trumpet and the baritone horn, often referred to as the baritone, play in the key of B flat. If you play a basic scale on these instruments without adding any accidentals, you play a B flat scale. However, in sheet music, the key without any accidentals is C major. To make life easier, B flat instrumentalists learn transposed names for the fingerings. The note they think of as a C sounds like a B flat on a piano. Music for the baritone horn in treble clef is transposed like this. Baritone music in bass clef is not.
Instructions
1. Identify the clef of your music. If it is in treble clef, it is already pitched for a B flat instrument, and you can play it on the trumpet without changing anything. If it is in bass clef, you need to transpose.
2. Rewrite each note of the music a major ninth higher than the original. To make this simpler, raise it a major second and then rewrite it in treble clef. For example, if the bass clef note is B flat, write a treble-clef C.
3. Look at the original key signature. Raise the key a whole step, and write the new key signature on the trumpet music. If the original key signature had two flats, making it the key of B flat, write no flats or sharps in the new music, putting it into the key of C.
