Rockstar, the developers of the very popular Grand Theft Auto series, has kindly set up playlists for every one of the series' radio stations, for use in both iTunes and Spotify. The GTA series is well-known for its music, and when Rockstar ported both GTA3 and GTA: Vice City over to iOS, we were fortunate enough to get the great soundtracks with them. But, of course, you can't always be playing the game, so if you want to listen to the music on your own, you can load one of these up in iTunes, and listen away.
Unfortunately, the games' commercials are not available in iTunes. Rockstar has set up a special "Advertising Council" site to let you listen in directly to the hilarious parody commercials from the series instead.
And of course this is all done in prelude to the upcoming Grand Theft Auto 5, expected sometime later on this year. No word yet if there'll be a Mac (or even an iOS) release for the newest game, but we'll keep an ear open.