Just in case anyone was wondering, you can still redeem a new Song Pack 2 code and everything will show up in RB4 (at least on Xbox), I just did it today. :
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XBOX 360) Rock Band (REGULAR GAME) Cheat - YouTube
i... i got taunted by harmonix, lol : r/Rockband
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Tips and Cheats for Rock Band on Every Platform
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How to Unlock all songs in Rock Band with a cheat code « Xbox 360 :: WonderHowTo
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Rock Band 2 codes to unlock all songs and cheats to get all instruments and clothes - Video Games Blogger
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