Never had this happen before!  Would be very annoying if it kept happening, but...
 
Anyway, I'm listening to a couple of albums using Foobar2000 (I bounce between multiple players so I can keep different playlists going) and I pause it but the music keeps playing!  So I close out of it completely (can't even find a process running), yet the music keeps playing.  I've checked everything else to see if maybe some other app (like Chrome) was playing music, but I'm pretty sure it started in Foobar2000.  I can't reboot just yet, but that's the final option.  
 
The funny part?  The music is very enjoyable to so I really want to kill it just yet - LOL! 

*PROBLEM SOLVED!*
 
I figured it HAD to be another app, so I kept looking and saw a little speaker icon on a Chrome tab.  Hovering over it told me that window was playing audio.
 
Turns out what I had been enjoying (and am about to play for myself now that I know) was Anathema.  The last album I have from them is from back in 2003, they've put out at least six more since - more to add to the list I guess.
 

 
 

 
 

https://www.youtube.com/watch?v=pkSRF-uHlWk

La de dah de dee

I think I needs to have me a Saxon day soon...