Hey peeople. I just found out the way to put your own songs on a radio in GTA IV. Let me know if someone already posted topic like that. Well if you want to listen to your own radio station, do the following:
ON WINDOWS VISTA:
Go to C:/Users/YOUR USER NAME/Documents/Rockstar Games/GTA IV/User Music
Put all of your songs in that folder. (i thinks mp3's only)
Then turn on the game. Go to Options. In there, go to Audio, and then all the way on the bottom click Complete Scan. Then wait till it scans.
After it's done, play the game, get into the car, and change the radio station to INDEPENDENCE radio station. DONE.
If you want to change songs, use B and N on your keyboard.