The Music Transposer is built for band rooms. Pick the instrument your part is written for and the instrument you actually play, and it shows the interval to move every note, the new key signature, and a side-by-side table of all twelve notes. Type a few notes from your part and they come back transposed, with a button to hear the real sounding pitch. It covers more than 45 instruments, from B♭ trumpet, clarinet and tenor sax to E♭ alto and bari sax, F horn, treble-clef baritone, brass-band parts, strings, guitar and mallet percussion.
Use it when a friend on a different instrument wants to play your line, when you need to read a part written for another instrument, or when you are arranging for the whole section. Results are saved in the page address, so you can share a transposition with a link.