So under my volume drop down menu, I have Spotify, Rhythmbox and VLC:

Here I can pause and play the various different applications. My question is, is there a command to pause the one that is currently playing, e.g. I could set up a short cut to pause whichever was playing. This is mainly because Spotify doesn't have command options as far as I can tell, and I would like to pause it using blue proximity when I get up?