This is just an oddity that I found on the web:
Skating Lessons with Dick Button @ Wollman Rink in Central Park
Part 1: http://sk8info.net/sk8lesson/db/01.wma
Part 2: http://sk8info.net/sk8lesson/db/02.wma
It's classic Button - "I have on a complicated, wireless microphone..."
Most of his advice is still true today.
Is it just audio?
Yes, just audio. They're in Windows Media Audio (WMA) format.
It sounds like it was originally a RECORD, like an LP or a 45.
You can hear the scratches and bumps.