[sassymuffinz]

So if my maths is right, 10K concerts over ~ 40 years - this guy was at a concert 5 nights a week every week?

[scrame]

Concerts usually have more than one act.

[jgtrosh]

Sounds like they might have been working the gigs? Maybe a sounds engineer

[philk10]

Just a fan who became well known and often got in for free - https://chicagoreader.com/music/tapehead/