I've been searching for melodic euphonium solos to practice lately. I'm looking for a piece where I can focus on my tone, not so much technical work so not a theme and variation or modern concerto. What are the best melodic euphonium solos out there? Piano accompaniment or unaccompanied preferred because I'm not looking to purchase a full band arrangement. Some examples I've come up with:

Panache - Dewhurst Robin
Arioso - Bach
Rhapsody for euphonium - James Curnow
Vocalise - Rachmaninov arr. Mead
Oh Danny Boy
You Raise Me Up
Gabriel's Oboe