Pre-loaded MP3’s.
Mine is on a flash drive plugged into the back of my speaker.
My co-worker has an old I-pod with thousands of songs loaded on it.
both play the MP3’s randomly thoughout the night.
He was on the other side of the building when i was listening to the song.
Today i happened to walk by the exact location i was at yesterday at almost the exact time (6am) and there was the song playing out of his speaker...
I caught just the tail end of it and turned around i said “Hey, that kind of sounded like the Smokey and the Bandit song”
He replied “yea it was...East bound and Down by Jerry reed”
I was like HUH?
Are your devices strictly isolated hardware?
No wifi connections?
No software/firmware updates?