Interactive tool
Euphonium notation transposer
A free interactive tool that converts any euphonium note between brass-band treble clef and concert bass or tenor clef — see the two staves side by side, and hear the pitch.
The euphonium is written two completely different ways — transposed treble clef in the brass band, concert-pitch bass (or tenor) clef everywhere else — and the same written note means different pitches in each. This tool converts between them.
Pick any concert pitch on the keyboard. The brass-band staff shows how that note is written in treble clef (a major ninth higher); the concert staff shows the sounding pitch and switches to tenor clef up high. The euphonium fingering lights up on the valves, and Hear it plays the note. Lock the concert clef to bass or tenor to see exactly why the switch happens.
Pick a concert note. The transposed staff writes it for a Bb euphonium; the concert staff shows the sounding pitch. Switch the transposed part between British brass-band treble clef (up a major ninth) and the continental ‘World’ bass clef common in the Netherlands (the same reading an octave lower — note the identical letter names). Lock the concert clef to see why it switches to tenor up high. Valves light with the euphonium fingering.
Use it to sight-read a part in the “wrong” clef, to settle a band-room argument, or just to build the two reading systems into your ear. For the full story of why the euphonium carries two notations — and which one you’ll meet in each ensemble — read the pillar it belongs to: