Well, Trumpet is in Bb and Trombone is in C, so transposing is the same as it would be from Clarinet to flute (which makes sense to me then).
First, the key changes....so if you were in Bb for trumpet, you would be in C for trombone...you take away 2 flats/add 2 sharps if going from trumpet to trombone.
Once the key is taken care of, then you can transpose by just taking the trumpet note and putting it down a whole step.
Then, you transpose it into bass clef, which is pretty self-explanatory, but you just take that note and put it down an octave or so, into the trombone's range.
Actually, part of that answer is incorrect. If the trumpet music is in B-flat, Trombone music (a concert pitch instrument) will be one step below that in A-flat.
trumpet music
The Trombone does NOT transpose, the player does. With that said, if the music is written in Bb Bass Clef, one does transpose in Bass clef. Most Bass Clef music is in C Bass clef, but the player has learned how to read in concert pitch, so there is no transposition needed.
Assuming the guitar music is written for a standard guitar with no capo, and assuming you are playing on a B-flat trumpet, you transpose up a full step. So, if the guitar note is C, you play a D on a b-flat trumpet. If you are playing on a C trumpet, you don't have to transpose.
trumpet, trombone, baritone, tuba, and french horn
trumpet
trumpet music
The Trombone does NOT transpose, the player does. With that said, if the music is written in Bb Bass Clef, one does transpose in Bass clef. Most Bass Clef music is in C Bass clef, but the player has learned how to read in concert pitch, so there is no transposition needed.
saxophone,trombone,trumpet and vocal.
Try your local library, mine has sheet music there, but most of it is piano and i had to transpose it
Assuming the guitar music is written for a standard guitar with no capo, and assuming you are playing on a B-flat trumpet, you transpose up a full step. So, if the guitar note is C, you play a D on a b-flat trumpet. If you are playing on a C trumpet, you don't have to transpose.
If it's a doble horn, just hold down the thumb key, and then play the trumpet music like it's horn music.
trumpet
Horn, Trumpet, Trombone, and tuba.
trumpet, trombone, baritone, tuba, and french horn
trumpet
trombone trumpet
Marching Trombone> It looks like a large trumpet. It allows for easier marching , not having to use the slide.