Trombone and tuba in Jr and Sr High, drum and bugle corp I played what most would call a baritone but it was a little different i.e. one piston valve and one rotatory valve. But now I am learning banjo!!
Holy cow, small world! Scott, where'd ya march? Madison Scouts 1991-1996 Baritone here.
Also Jr. Scouts in 1990, and the Madison Scouts Alumni Reunion corps in 2006.
My first full camp at Scouts was when we got the first three-valve horns. Valve-rotor would put you in the 70's or early 80's eh?
My main non-drum corps brass instrument is Euphonium, often but incorrectly called a Baritone in the US. (I have only ever seen three actual baritones on this side of the pond, though they're quite popular in the British brass bands.) The difference? Euphonium is conical bore, Baritone is cylindrical.
My dad is also a Euphonium player, and played in a German polka band run by one of his colleagues. One of the things they played was Lassus Trombone, and I always got a kick out of the wonderful glissandos. So, I started on Trombone in 5th grade. Middle school, I switched to drums (tryin' to be "cool" ya know) and when I got to high school there were too many drummers. I knew the valve combinations and how they related to the trombone slide positions thanks to my dad, and the band director said I could play either trombone or euph, but if I played trombone I'd need my own horn. So, I switched to euph and used my dad's horn. It also just so happened that I sat next to the guy who was the drum major for the Junior Scouts that year, and he took me to a rehearsal one day, and thus began a life-changing journey. But I'll spare y'all the rest of the story.