Yada is referencing SONOS Connect. In GGW's scenario where he wants to carry his laptop around with him, or play from where ever his laptop is, that should work.
I was imaging a scenario where GGW would like to keep his library stationary, and then use a phone to choose the songs to play. That's going to take a little more time to figure out, and probably require a cloud based solution for his music.
Another alternative to SONOS is a Chromecast Audio, but that won't play well with iTunes. Which was my next question - why are you still using iTunes?