I worked at a Kroger store in rural West Virginia (the town of Madison,
30 miles south of Charleston in the coal fields) in the early 90s and
we had this extremely antiquated in-store music system. The store had
been built in the early 80's and the sound system involved this box
with about 10 large tapes in it. The tapes looked kinda like 8-track
tapes, only they were about 8" by 10" big (but flat, like an 8 track).
Anyhow, they weren't using the sound system when I got to this store,
so I took it upon myself to get it up and running so I could drive the
employees batty with the crummy music (I was the assistant manager, so
it was my job to drive them batty as it was their job to drive me
batty). It was about 3-4 notches below Muzak music in terms of
quality. Anyhoo....with this in mind, I suppose it's possible that if
you go back to the Purity Supreme store where you worked that all that
music could be on tape. Think about it....it's not likely that the
music was piped in via satellite like it is now. Of course, you did
mention that it is now defunct, but is the building still standing?

Good luck.

Mike