UPDATE: Try Santa Rockstar 3D!! available for PC/Mac at www.santarockstar.com
UPDATE: View the video telling how santa became a Rockstar here: http://www.newgrounds.com /portal/view/585834 !
Use ASD and KL in Basic mode to play the notes. In Rockstar mode use 1-5 to hit the notes and press ENTER to strum the strings.
When the Frost Meter is full, hit the SPACE key to double the score multiplier.
If you don't like the controls you can change the keys in the main menu.