After looking around I have found the best solution to be something called audio|acacia by a group called Plethra.
audio|acacia lets you play music from your iTunes / iPhone / iPad / iPod / Android Device / Internet Radio / etc. to any AirPlay device including your AirPort Express / Apple TV / iPhone / iPad / iPod / Computer / etc. Not only can you play to all of them, but you can play to all of them and have them be in sync with each other. You can also play one song to a group of speakers and another song do a different group of speakers at the same time. It's pretty awesome.
So, it was hard to find, but I found what I was looking for.