Optional controllers (PC)
Using a USB cable for the XBOX 360 controller you are able to use the controller to play games on your computer. Once you plug it in press and hold the home button for three seconds and then let go. The computer should then install all the drivers that are needed for the controller to run.
Optional controllers (PS3)
The game Guitar Hero comes with its own controllers that are in the shape of a guitar. Using the wireless adapter that comes with the guitars they do not need to be plugged into the console itself as they communicate with the adapter. You can then use these guitars as a controller.