I don't remember which song now but when I switched from iHeart's Mix 99.5 Greensboro either because of a bad song or commercials, I switched to Charlotte's K-104.7 which is not iHeart, and I still heard the same song that had just finished. It had to be a coincidence because iHeart has a Charlotte station.
But it does seem to be true that if you can listen to multiple iHeart stations, they will be playing the same songs at about the same time.
But it does seem to be true that if you can listen to multiple iHeart stations, they will be playing the same songs at about the same time.