WEll I have finished Expert mode in it. You get a guitar with the 70 dollar version, or just the game disk with the 40. You have 5 fret buttons, green, red, yellow, blue, and orange. There are also : 1 whammy bar, 1 strum bar-thing, a D pad, start and back buttons, and the Xbox Guide button.
You have to press from one to three of the fret buttons at the same time, and strum when the notes on screen cross the place when you have to strum.. Its pretty easy after you play and beat easy mode. I can play with both the controller *I'm not as good as that than the guitar* And I rule with the Guitar.