Here’s something interesting, on the topic of InGame Radio Stations: Minstral Productions, an audio production company who are responsible for some of the radio stations GTAV. Whereas something like Fallout 3 had one main radio station that provides references to the story and player, GTAV has dozens of stations, many completely independent of your actions in-game.
Maybe contrasting the differences between these approaches? Certainly for some missions, GTA “highjacks” a station to play relevant music, but you’re still free to change it. This doesn’t happen really in Fallout. Eitherway, here is the link to Minstrals website about their station.