PSA: All forthcoming Rock Band DLC incompatible with RB1/RB2

Joystiq writes:

"Rock Band DLC released after October 26, 2010, is Rock Band 3 specific and will not be compatible with previous versions of the platform. This rule applies to all future Rock Band DLC, whether it's labeled "RB3 version" or not. Songs released before that cutoff date will remain available and compatible with the first two Rock Band titles. Also, new RBN tracks will be compatible with all versions."

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