Rarities from the vault: Sonic's Rendezvous Band and Scott Morgan Band
The audio is from a Sonic's Rendezvous Band show from 1978, recently unearthed by Michigan multimedia producer Ed Primeau and left with him for safekeeping. The montage was done by one of Ed's employees.
And here's a Scott Morgan Band/Scots Pirates promotional clip Ed dug up:
That second one would be rarer than a piss-up around a TV set in an Amish elder's lounge room, I'd reckon.