Some youtube.com offerings of the glorious euphonium.
First is a tube/euphonium quartet from the American Second Infantry Division band playing an arrangement of Birdland. It cuts out aftef 2:44 but there's enough here to show what you can do.
Can ya dig it? I knew ya could.
On the other end of the spectrum in more ways than one, is a song by The Born Again Floozies: "I used to play euphonium".
Dig it, too or just dig the cymbal-playing tap dancer.
Then, from somewhere else entirely in the vast expanse of the twisted human psyche comes this piece:
To finish, there is this short clip of two guys playing the Mario Brothers theme, flowed another similar duet.
There's some kind of international thing going on with this.