https://www.polygon.com/2018/4/14/17238762/grand-theft-auto-4-music-removed-licensing

Grand Theft Auto 4’s music library is getting a trim as licensing agreements expire on the now decade-old game. So if you’re a player and you notice that an update coming at the end of the month wipes out some songs, this is what is going on.

Kotaku UK noticed the oncoming changes earlier in the week, then confirmed with Rockstar Games that licensing terms were the reason. The changes will most affect the Vladivostok FM station in the game. A large portion of that playlist has to go, and Rockstar said it will replace those songs with a new set.