Steps to putting your own music into the Sims 2 game
1. Open up the following folder
mydocuments\eagames\thesims2\music
2. Inside the music folder create a new folder called radio station.
3. Copy your own MP3 files into the new radio station folder.
4. Start the game. Go to the Options Menu.
5. Select Music Settings and then the Radio Station Option.
You can now choose which songs you want to hear.