Re: Sims 4 won't play custom music.

There are some bug fixes:

• Custom music tracks will no longer choose to play silently for no apparent reason when listening to them on the stereo.
  • However, I have to wonder if it was just the game deciding it didn’t like a particular track.
    
    Source: http://sims4.crinrict.com/en/2015/08/patch-1-10-57/

If you have any other problems with music, or the problem is still going on after the update, please make your own topic.