Hi have to agree, we are still waiting for a resolution to this Apple, I hope your listening, for example in my household we have an Imac, Macbook pro, Apple tv, 2 ipads, two iphone 6's, Time capsule, Airport express, sonos play1 x2, sonos connect amp, airplay compatible pioneer amp and can I easily listen to my music sources no I can't!
Its frustrating, yes I can listen to itunes to more than one device from Imac or macbook but who wants to be tethered to that?
What about when my music i want to listen too is spotify or something other than itunes, i can't play them to more than device.
All the music that I could ever want to access can be had from my iPhone in my pocket, but again I can't do it from there either.....
Please Apple, it can't be too much to ask that you implement the ability into ios to airplay to more then one device, and not just from iTunes.