So far, the Guitar Hero series has released games for the Wii, Xbox 360, PlayStation 2, and the PlayStation 3. However, a new release for the Nintendo DS is being planned.
Yes. The Guitar is compatible with both guitar hero 2 and 3. Also, the guitar hero guitar on xbox 360 is compatible with rock band for xbox 360.
Yes it is compatible with GH 5.
The Guitar Hero III guitar is completely compatible with Guitar Hero: World Tour provided you're still using it with the Wii.
yes
Yes they are 100% compatible.
Yes, all Guitar Hero guitars are compatible with every guitar hero.
Yes it is compatible \X...X/
yes
Yes
No, you can't use controllers between different consoles, but only with the same console. So you can use Guitar Hero PS2 controllers with Rock Band PS2, but not Wii.
Yes it will
yes