No it isn't.
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Yes, on Xbox 360 all Guitar Hero world tour, Rockband, guitar hero 3 games are definitely cross compatible with instruments (obviously not with using the durms on guitar hero 3) and more then likely guitar hero 2.
you need a controller (Guitar controller or xbox controller) and i think you need a little receiver (or is it not needed?) and the game, and a tv
yes
for the XBox 360, all guitar hero guitars can work in any direction
Yes they are =)