Any way to control non-tunes sources

I currently use Pandora and Spotify on my laptop and use Airfoil to play it. I am very interested in simplifying the system so that renters, and my wife, can easily play music. The server the mac mini that will host Indigo7 is in a closet. Without being able to control the source of the music, I am not sure that the Airfoil capability of Indigo is applicable. I can think of some complicated scenarios of using a laptop that shares the server screen. Am I missing something?

Are Pandora or Spotify apps for Mac appleScriptable?