This page describes the Music Option.
Sims music is in a class by itself. Well-known real-life artists make it a point to be heard in your game somewhere if at all possible. Check out the Song List for a complete list and short preview of in-game songs. But if you are particular about your music and want some options, then custom music is for you!
Installing Custom Music
To install custom music, copy any MP3 file to the following location:
C:\Users\UserName\Documents\Electronic Arts\The Sims 3\Custom Music
MyDocuments\Electronic Arts\The Sims 3\Custom Music
There is also third party software available to manage your Sims music. If you have the game open, you will have to restart it for the new music to show up. Go to the options menu by selecting it or pressing F5.
One of the first things to look at is your Sound panel.
Make sure it is set up properly for your speaker system.
Notice in the example that the slider for Music is turned way down.
Adjust this until you can hear your music clearly at the volume you are happy with.
To listen to any of the music included with the game, look at the music panel.
It will show which songs are in the game and which places they can be found.
You can even listen to a preview of what the music sounds like.
A bit disappointing is that you cannot see your custom music here.
Custom Music Channel
The only place to listen to your music currently is to turn on the Custom Channel of the stereo.
There is no ability to play your own music in Build Mode or Create a Sim or anywhere else at the current time.
It is hoped that changes to this will be coming.