https://www.pcgamer.com/rockstar-confirms-that-some-grand-theft-auto-4-music-is-being-removed/

Licensed music can be a fantastic tool for bringing game worlds to life. There's just one drawback to it: Licenses have a tendency to expire. And when they do, that great music goes away. Grand Theft Auto 4 will soon suffer those wounds of loss as well, as Rockstar has confirmed a Kotaku UK report that some of the radio station music we know and love will soon be removed from the game. 

"Due to music licensing restrictions, we are required to remove certain songs from the in-game soundtrack of Grand Theft Auto IV and its Episodes, in particular a large portion of the Russian pop station, Vladivostok FM," a Rockstar rep said. "However we are replacing some of those songs with a new set of songs on that station. We will update our customer support website with new information as soon as it is available."