You already have a ton of options when it comes to cloud-based music, including iTunes Radio, Pandora, Spotify, Rdio, Amazon Cloud Player, and more. Yet you might want to consider Google Play Music, since it offers a combination of features not otherwise available. As you know, services like Pandora and iTunes Radio let you listen to songs similar to what you like, but you're unable to request specific songs. And subscription services such as Spotify and Rdio let you request a particular song and typically charge a monthly fee of around $10, but they don't store your personal collection in the cloud. Then there are services like iTunes Match and Amazon Cloud Player that let you upload your collection to the cloud and stream music that you already own. Google Play Music combines the ability to request specific songs (like Spotify and Rdio) with the ability to upload your music collection (like iTunes Match and Amazon Cloud Player).