https://www.wired.com/1994/04/radio-microsoft/ (check out those single-digit wait times.)
I worked there when it was still going, but I don't recall if it was employee-accessible or not. I seem to have some vague recollection of having heard it, but I might have been actually making a support call for a product.
It's hosted in Bentonville, but distributed to all the stores in the US, as well as some international locations.
Associates (Employees) can call in and request certain songs, give shout outs to another associate, etc.
https://www.walmartworld.com/content/walmart-world/en_us/rad...
Disclosure: Used to work at Walmart Corporate.
From the irony? ;)
3 days a week for what felt like a whole year I was hearing that "Hot and fresh out the kitchen" song. I think it was about sex.