The service was previously only available on Xbox 360, Windows 8 and Windows Phone, but now (just about) everyone else can get involved with the web-based version that conveniently adapts to your browser size.
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Sung to the tune of Zune
You'll need to be a Xbox Music Pass subscriber to use the web player, though there's also a 30 day free subscription on offer to entice newbies.
While it previously said they were on their way, Microsoft hasn't mentioned anything about iOS or Android apps, but we've contacted it to ask and will update if we hear more.