Pre-order The Beatles: Rock Band through GameStop, get free songs
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Those that pre-order The Beatles: Rock Band through GameStop will receive three additional songs for free as well as the unlock code for the game's photo book album.
It's assumed that the tracks will later be available as part of the promised DLC, since the order page does not go into specifics.
Abbey Road will be released as DLC along with the Xbox 360 exclusive "All You Need is Love".
Thanks, D'toid.