Announced at E3, Xbox Music is Microsoft’s (MSFT) own subscription-based music service that will rival the likes of Spotify. A new online leak for an update to the Xbox 360′s dashboard in the U.K. has prematurely revealed that Xbox Music will be priced at £8.99 for a monthly pass and £89.90 for an annual pass. It’s speculated that Microsoft will launch Xbox Music in the U.S. with the same prices as its current Zune Music Pass service: $10 per month or $100 for a yearly pass. Another leak from NeoGAF also suggests that a free, ad-supported version of Xbox Music will also launch alongside the subscription service that will allow cross-platform playlist syncing between Xbox 360, Windows 8 PCs and Windows Phone 8 smartphones. Xbox Music is slated for a launch this fall and will replace Zune Music Pass. Microsoft says the service will have a library of 30 million tracks.