To make the magic happen, you will need to install a little piece of software on your Mac. It's called the reemote server. It is a server application for Airfoil software. Send any audio from your Mac to AirPort Express units, Apple TVs, iPhones and iPods Touch, and even other Macs and PCs, all in sync! Use Airfoil with web-based audio like Pandora, music services like Spotify, Rdio, MOG, and WiMP, or any other audio playing on your computer.