Transposing bass clef euphonium score to equal treble clef score

First, be sure of the instrument. Is it a concert C Euphonium or a brass band Bb instrument?

Yes, this is possible.
- Write down the euphonium staff exactly as it appears in the bass clef on the template.
- Clarify whether your musician is used to playing a Bb or a C euphonium.
- If it is a Bb instrument, simply change the instrument from euphonium to "euphonium (treble clef)" in 'staff/part properties'. (I think this is true in most cases)
- If it is a C instrument, open your clef palette and drag the treble clef 8va bassa to the euphonium system with the bass clef.

As I use MuS 3.6.2 the menue items may be slightly different in MuS 4.

We suppose it is traditional bass clef / concert key*, then copy the whole thing on MS4, then right click on the staff and choose Staff/Part properties

Now click on replace instrument and pick: Euphonium treble clef (or Baritone Horn treble clef).

*In some countries Bass clef is used with Bb instrument.

I just finished transposing euphonium bass clef to euphonium treble clef in musescore 4, this is the steps I used.

• Create the part in Bass Clef
• select measure 1 (highlighting whole measure)
• Right click mouse
• Select “Staff/Part properties “
• Under “Part properties “ select “Replace Instrument “
• Select the down arrow on the right in “Common” box
• Select “Concert Band and below it “Brass”
• Select “Euphonium (treble clef) in the list on the right
• Click “Ok”
• Then click “Ok” or “Apply”
If the clef is still Bass Clef, select Treble Clef from the Clef menu
This sequence worked for me.