Microsoft have updated the Xbox Music app for iOS to add support for offline playback.
The official change log reads,
“Make your playlists available offline, and listen to your favourite music on the go!”
This is the only change in the 2.0.31213 update, but certainly a welcome one for the users. Make sure you choose to download your playlists offline.
You will need an Xbox Music Pass to use the app, you can get it from the official website.
Download the Xbox Music app from the iTunes store.
The app is compatible with all iPhones, iPads, and iPods running on iOS 6.0 or later.