This was a high point in Ontario drum corps. I started marching in an Ontario corps in 79 but I don't think the decline starting that year was really my fault. :P
Including the alumni corps we have left today:
Bandettes, Sault Ste. Marie Ont
Blue Saints, Sudbury Ont
Kiwanis Kavaliers, KW, Ont
Scout House,Cambridge, Ont
Seneca Optimists, Toronto, Ont (i.e. Optimist Alumni)
:(