GameSpy says it's great fun for kids and multiplayer. 7/10
The problem seems to be that you have to create your own quality. Matt didn't put any effort in it and all he ended up with was garbage. The lady of 1UP had a musical background and she really got a lot out of the game.
What I'm personally interested in is the jam sessions with overdubbing. First you play the guitar, then you add the piano, bass, bagpipe, whatever. Up to 6 instruments. And you can do variations on the standard tunes. Like in this movie:
So is anyone getting this? I'm afraid I'm not, I don't have time/money for it.
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It may have other powers than just making you vanish when you wish to... The One Ring