Harrison said that the anticipated rhythm game will include "stuff that has never been heard, never released" in a recent Billboard interview noticed by Destructoid.

"I took the project to Apple and sort of convinced everybody to have a presentation," added Harrison. "We've been working on it for the past two years. This is the first one that is going to be totally, historically accurate. It's been a real headache, but it's been the most enjoyable work I've done in my life."

The Beatles: Rock Band is scheduled for a stand-alone September 9 release on PlayStation 3, Xbox 360, and Wii.