To play your own music on the stereo, go to Maxis/The Sims/Music/Stations and put your own music in it (make sure the music is mp3). Keep the same name as the music already in there, and copy the existing files. If there is no music in the folder, there is in the music folder on the CD. Just rename the file, and when you turn on the stereo, you can play the files you chose.