If you haven't heard this iTunes exclusive version of one of MDNA's best tracks, click the link below...

http://www.youtube.com/watch?v=SSLQeax5brk

This was recorded after the album was complete and was produced by William Orbit. I just wondered whether any other acoustic versions of MDNA tracks were recorded during the same sessions?

Also, have any unreleased MDNA tracks leaked yet which are worthy of a listen?