This can be attained near the beginning of the eleventh level: "Put the Thing on the Thing".
You have to get every move to be 'awesome' as there are only 21 moves in this mini-game.
You must wait a moment when the button reaches the circle before you hit the prompt otherwise it will be a 'good' rating.
This mini-game can be replayed as many times as required; just return to the dance platform and press (B).
*Note: This was done in Story Mode but it can also be done in Free Play mode.