airport express speaker hack
I’ve been looking for a solution to this for ages… maybe the wrong keyword search combination? Well anyhows, I can now listen to tunes through apps like Spotify or any other not iTunes app, wirelessly via my airport extreme!
Send any audio to the AirPort Express. Send any audio to AirPort Express units, Apple TVs, and even other Macs and PCs, all in sync! Airfoil for Mac gives you your audio – everywhere.
I believe this program works, though you have to buy it. (hacked versions can be downloaded off of various torrent sites). AirFoil is what you are looking for. http://rogueamoeba.com/store/