Six months after its subscription music service came to Android and the web, Google is bringing its take on unlimited streaming to the iPhone. And while much of what the app offers on iOS has been available on Spotify and Rdio for years, Google has invested enough in helping users discover new music to make their version worth a look. The free version of Google Play Music allows you to listen to any of the songs you have backed up to Google's cloud — the company lets you store up to 20,000 tracks at no charge. Google's catalog now includes more than 20 million songs



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