Euphonium players (me included) have often "borrowed" from Mozart, and even borrow from French horn works now and then. This lively Rondo works very nicely on euphonium IMHO, although it is a bit harder to accept a brass band accompaniment (particularly with the "older" brass band style here). But solid playing by Lyndon, as always.
https://youtu.be/fyuHTp9Rtsc