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Crono said:

Each instrument in Rock Band is its own fully featured game (except bass guitar).  You don't NEED 4 people to play each instrument, you only need 1, yourself, and the game will cover the other parts.  And if you have 2 friends, you can play 2 instruments and the game will cover the leftovers.

Rock band is literally 4 times the game GH3 is.


don't you need to buy them altogether though? How does that work?