First announced back at E3, Microsoft today revealed the first serious details about its Xbox Music service, which will use the cloud to stream a music catalogue across platforms like the Xbox 360, PC and Windows 8 tablets.

It'll have around 30 million songs when it opens. It goes live on the Xbox 360 tomorrow, while Windows 8 devices (like the PC, tablets and phones) will gain access to it on October 26.

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Importantly, like major competitors such as Spotify, it'll be free on Windows 8 and Windows RT. Unlimited offline access and the banishment of ads will cost you $10 a month or $100 a year.

You can read a ton more, including hands-on impressions, over on Gizmodo.

Xbox Music Hands On: The Perfect Music Service-If You Use Nothing But Microsoft Stuff [Gizmodo]