Could this be the first usenet post mentioning drum corps?
From: Flip Phillips (flip@osu-cgrg.UUCP)
Subject: DCI - any of you out there? Newsgroups: net.music Date: 1985-11-06 08:24:21 PST *** REPLACE THIS madison WITH YOUR garfield *** any body out there doing anthing with Drum Corps Intl, like marching or teaching? It's been a while since I had anything to do with DCI and i am interested in whats going on. I'm back to teaching a drum line at an area High School. I'll probably march for Redding Bucks next summer( any body else going to do the same). flip phillips ...!osu-cgrg!flip cbosgd!osu-eddie!flip
Here’s a link to the post in Google’s usenet archive.