GTA IV - Great in-game music marketing
Everyone loves the music and banter on Rockstar Games’ Grand Theft Auto radio stations. And apparently the new Grand Theft Auto IV game will allow you to call up the “radio station” from your character’s in-game cellphone, and “request the name of that track”. Then, the good folks at Amazon MP3 (in real life) will email you (or SMS to your real mobile) details about buying the song from Amazon’s DRM-free music store. Cute idea.
Details about GTAIV Music Downloading at ARS Technica
P.S Karl Lagerfield DJs on one of the radio stations: http://www.rockstargames.com/IV/#?page=k109&content=interactive0