Play music without monitor/TV

Hi, ah your on the wrong forum. Head over to
http://forum.kodi.tv/forumdisplay.php?fid=166
https://www.raspberrypi.org/forums/
Your question is more or less a KODI thingy,
Didn’t know that the Pi3had an optical digital output. off the quick
Look in Settings - System - Audio output. You’ll see what I mean.