I don't see a big difference.
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The difference is that Focus Sash works when your Pokemon would have been KO'd in one hit from full HP, while Focus Band has a 10% chance of protecting your Pokemon from being KO'd from any HP.
The Beatles.
Yes the guitar controller for Rock Band will work on Guitar Hero World Tour. Rock Band drums and microphone also work on Guitar Hero World Tour.
the guitar hero or the rock band 2 microphone.
Yes.