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  Microsoft announced Xbox Music at this year's E3 gaming expo.
• Microsoft announced Sunday that the all-in-one service will feature streaming online radio, an ad-supported or paid subscription service and music purchasing.
• It begins rolling out Tuesday on the Xbox 360 system and will expand to the rest of the Microsoft product universe when its new operating system, Windows 8, is released October 26.
• It will eventually be available on devices running Apple's iOS and Google's Android operating systems.