Mozart's 5 Divertimenti K439b, originally written for 3 basset horns, have been arranged for many combinations of instruments. I have arranged this one (No.1) for three euphoniums (or trombones) . I have transcribed the parts into concert pitch F in order to fit all the parts into a comfortable range. I have taken some liberties in the 3rd part, transposing up an octave where necessary, but avoiding any "clash" with the two upper instruments. There is an overlap sometimes where 3rd is playing higher than 2nd, but the harmonies are still fine. I have included both bass and treble clef versions of all 3 parts, as well as a bass clef tuba part as an alternative to the 3rd part. I feel it works well as a low brass trio.