As I understand it, the more popular the song is in the market for the local affiliate, the more often you’ll see it.
So while there was no “rotation” as @JustCKing first claimed, it might have felt that way in ATL while maybe the video was played less in Philly or other markets out of the South. I’m not saying this happened, but it’s possible based on how the Box worked.
That is not how it worked. Those plays were based on requests paid for by viewers. It didn't matter what location you were in, if that song was popular you were going to be seeing it ad nauseam. That's why they used "Crossroads" as an example. It didn't matter whether you were from Cincinnati, Denver, Atlanta, Philly, Vallejo, or some small city in Missouri, if you had access to The Box, you were going to see that video.