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Certainly.
Yes you can.
yes the rock band guitar is compatible with rock band 2
Yes. I use my GH3 controller when I play Rock Band.
Yes you can.
After you dont playing gh5, just leave the guitar with the same setup and play rock band with it
Yes but It will not work for rock band though
Both Guitar Hero: World Tour,GH5, and Rock Band 2 have song creation tools.
No, but if you don't have a guitar you can only play with the mic. or the drums.
yes, you can
well ive seen people play guitar hero with rock band drums so i don't see why not
Yes, but I would recommend the rock band guitar.