You can play in the cheats section .i have played the main riff of iron man in there.

Select the traing opition from the main menu. Click on tutorials and scroll down to the last opition the hammerons. As soon as you click on the tutorial exit it and go back to the menu with the opition of tutorails and practice instead of clicking tutorials click pratice and all of the songs except bonus and downloads should be five stars with a million score to the right.{this only works on the practice menu.}

This cheat only works on practice mode. First select the training opition in the main menu. Second you click on tutorials and scroll down to hammerons and as soon as you get on the tutorials quit the the tutorial and go to the parctice mode right after that {note: you do not go back to the main menu.} all of the songs exept the bonus songs should be 5 stars and have a milllion score next to it. If you have any questions just ask me.

Here it is...

(GR)(GY)(YB)(RB)(BO)(YO)(RY)(RB)

P.S
For that person in the Q&A who said this cheat wasn't real, I proved you wrong.

Sesame_Ramen :)

There are easy steps to doing so.

1: Go into CHEATS mode. You are not entering a cheat.

2: Play the following notes in tune to Ironman by Ozzy Osbourne.

Play red+green, red+yellow, (red+blue) twice, yellow+blue, yellow (twice), red, green (twice), red, yellow. And Repeat that once for the chorus of Ironman by Ozzy Osbourne.

There are easy steps to doing so.

1: Go into CHEATS mode. You are not entering a cheat.

2: Play the following notes in tune to Ironman by Ozzy Osbourne.

Play red+green, red+yellow, (red+blue) twice, yellow+blue, yellow (twice), red, green (twice), red, yellow. And Repeat that once for the chorus of Ironman by Ozzy Osbourne.

I found that the best way to beat easy if you are great at GH.

Try playing lefty?
It will be almost as if you started over again. I will take some getting use to.

This also gets you the acheivement!!