you go to your documents folder and then electronic arts folder click on that and then there will be a sims 4 folder click that and a custom. Go to your games' 'Custom Music' folder which is normally located in C:\Users\you\Documents\Electronic Arts\The.If you've installed your game in the default location, your Custom Music folder will be located in Documents > Electronic Arts. Go to your game's 'Custom Music' folder which is normally located in C:\Users\YOUR USERNAME\.Choose which songs you want to put in the game.