In this Reddit thread, a list of the songs in Grand Theft Auto are listed along with an accompanying YouTube link. Here is a link for the entire GTA V radio. It’s a three hour download though. You can also view the tracklist below.
West Coast Classics
Classic Rock Stations
Radio Los Santos
[The Alchemist + Oh No (Gangrene)](?????)
Non-stop Pop FM
Chief Keef - Love Sosa (Not 100% on this song.)