I tried Christian's workaround (see Tips & Tricks) for the problem with the music not playing on Morrowind on my Mac and could not get it to work. Searching through this site I found a similar fix for Spotify which I applied to my Morrowind bottle and it worked.
After applying workaround (1) of Christian's fix carry out the following:
Add the library in Wine :
- Open the wine configuration tool of your Morrowind bottle
- In the library tab, type winemp3.acm on the "new replacement for" field and click on "add".
- Choose yes on the warning window
Reboot your bottle
Make sure you back up the bottle before applying the above.