This trick requires precise timing. Doing this wrong will cause you to fail quicker than not strumming at all. Play the notes as if it was a double note instead of a triple note. You must strum up and down at a constant rate in order to successfully do this. You must play the solo as usual, but afterwards the rest is easy. You should get at least a 90% on the song if you get 60% on the solo and do well afterwards.
Quickly press Red, Yellow, Blue, Red(2), Blue(2), Red, Yellow, Blue at the title screen when "Press Start" appears on the guitar or drum controller. Enabling this code will disable game saves.
On the big rock endings you can lean forward and hit 1, 2, A, and B on the drums to score more points.