Not counting people I actually marched with, on the marching side I've met James Campbell, Nick Angelis, and Murray Gusseck all outside of DCI.
When I was in my first year at Boise State, we had a clinic day that included both Murray Gusseck and Todd Sucherman of Styx. A few of us from the band were doing set up/tear down stuff, and we were all eating lunch between clinics. We'd ordered pizza and we were pillaging the band's leftover bottled water, pop, etc. from the previous season. I asked Todd if he wanted anything and his response was "I'll take whatever, as long as it's not diet". I, of course, said "Why's that?"
Sucherman then proceeded to give us a 45 minute lecture on the dangers of artificial sweeteners while we ate pepperoni pizza. One of the most surreal experiences of my life.
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Colts 00-02
Boise State 08-now
With a few teaching stops in between.