Japanese DS fans with a keen enough interest in learning music from a cartoon bug* to preorder the game will be rewarded with a tote bag featuring the Mushi himself and his butt-biting dancers. Just think -- you could be environmentally responsible with your groceries and celebrate an obscure Japanese fad! If you happened to be in Japan on April 10th.
*Actually the educational material is created by the Kawai musical instrument company, and then made to appear as if given by a cartoon bug. It's a trick.