If you've been paying attention to the tech rumor mill as of late, you probably know that Amazon has been planning to buff up its Prime subscription service with a musical component. The web retail giant flipped the switch last night, and now Amazon MP3 is Amazon Music. If you already have a subscription to Amazon Prime (which offers free 2-day shipping and access to Netflix-style streaming TV and movies), then you're now subscribed to Prime Music, the service's premium competitor to Spotify and Google Music All Access.

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