ANSWERS: 1
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Rock Band Track Packs are standalone video games and do not require Rock Band 1 or 2 to play. You will need a Rock Band-compatible controller to play a Track Pack, and you may also import songs from Track Packs into Rock Band 1 or 2.
Source:
IGN Wii: Rock Band Track Packs
RockBandStore: Official Track Packs
More Information:
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