HI..I was also suffering from exactly the same problem then i searched and searched but found nothing then I finally came up with the solution myself.
Here it is:
GO to settings
Select music in the menu
Then make sure ur Apple Music is turned on
If not then turn it on
Then go back to Music
Hopefully this should work..
If not then reboot ur Apple Device (Hold sleep/wake button and home botton together for about 10 sec then Apple logo will appear and ur device will restart...Nothing will get lost its just like restarting a computer)
Hopefully it should work...
Thx
Regards,
Harry