I was also a loser on the radio program "So you think you can walk and chew gum at the same time?" Pretty boring on the radio, actually.
Since I am Jim Brainless, as opposed to Dennis Brain, I am able to get through an occasional piece successfully, mostly by luck.
In fact, I will be playing a real, honest-to-goodness EUPHONIUM CONCERTO in a year. With a real good college conservatory wind ensemble. With the person for whom it was composed wielding the baton. With the composer in the audience, even.
Actually, your piece lies pretty well on the euphonium, except for my occasional need to breathe. I played along a bit. Fun!! I don't think there was a note above C5, but I can't recall right now. (I call C4 middle C)
The low C that starts the piece is a real honkin' note on my teutonic monster compensating euphonium, and I'm good on the high end up to the F an octave and a fourth above middle C on that instrument. I play french horn parts on my "littler" euphonium in my brass quintet and sometimes cover a horn part in a large brass ensemble if a player doesn't show. But I play right-handed and can't stick my fist in the bell of the euphonium very easily. I also miss fewer notes.
Did you know that the horn actually has the same total tube length as the F tuba?
As you may conclude, I am having a bout of insomnia this evening.
Snor (actually not snoring now ) lax