Microsoft today launched its Xbox Music service on iOS and Android, expanding the service to other devices almost a full year after its original introduction. The company has also introduced free ad supported web-based streaming for all browsers, but mobile users will need an Xbox Music Pass to access the service, which costs $9.99 per month after a free 30-day trial. The Xbox Music iPhone app includes a number of iOS optimized features such as the ability to multitask with Xbox Music running in the background, artist-based radio stations, and playlists that sync across all devices. Xbox Music Pass on iPhone features: - Stream ad-free music from a catalog of tens of millions of songs - Add songs, albums, and playlists to your Xbox Music collec