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Guitar Hero World Tour is Guitar Hero 4.
It all depends on what you like. I personaly like guitar hero on tour.
yup
No
NO
I believe you can, yes.
Guitar Hero World Tour and Guitar Hero Metallica
yes
It depends if the Guitar Hero 3 songs were released as DLC on GH: World Tour. There is no way to directly import songs from Guitar Hero 3 onto World Tour.
No
No only guitar hero world tour P.S. you can only play the drums on guitar hero world tour
impossible, unless you use hacks on the computer