It was in one of these forts I first heard Led Zeppelin IV - forever known as ZOSO.

FORBES: Celebration Day: Invoking The Legacy Of Led Zeppelin

It's possible that this could mean that they're simply going to rerelease Xbox 360 versions of current Xbox titles, sort of like how everyone bought Led Zeppelin IV all over again when it came out on CD.

ENGADGET: Xbox 360 to be backwards compatible?

He engineered a number of classic albums including Led Zeppelin II, III and IV and the Stones' Exile On Main Street and Sticky Fingers.

BBC: Rolling Stones engineer Andy Johns dies aged 62