Musical arts has been dying a slow, painful death up here. There is the offering of the typical musical menu.... stage band, orchestral, vocal.... but it does not start until the high school level if it is offered at all. Plus to be in these bands, having a musical background or training helps get you a seat. In other words, if your child shows any aptitiude towards any instrument, private lessons are in order, and not every family can afford the cost. High school marching bands do not exist here. Yes, bands like Burlington Teen Tour Band operates, but outside the educational spectrum. In short, drum corps offered what the public school system didn't.... a musical education, complete with marching skills and an area of competition.
Yes, drum corps thrived in the 70s and 80s up here... even little towns had a drum corps of some sort. The reason, IMO, that Dutch survived when the activity slowly diminished is primarily because of the Northstar Youth Orgainzation. NYO organized the fundraising, the BOD, etc, so that the directors of the corps could consentrate on running the corps, the winter colour guard, and the feeder unit.
Some other would know far more than I do, but I do know this.... talented kids went south of the border to march when they outgrew what was being offered up here.
Add: When I marched, music teachers hated drum corps with a passion. If you marched drum corps. it was a death sentance to any chance of playing in any band, no matter how good you were in general.