Rdio lets you listen to what your friends are sharing on PLAY – if you’re an Rdio subscriber and have the app downloaded you can listen to the entire song! If you’re not subscribed to Rdio, you can listen to a 30 second preview of the song. Rdio integration is only available on the Android version of PLAY.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them