The music is mostly as basic as it gets; people usually need some simple basic fiber in their diets among the more fancy stuff, and Green Day did manage to do more with three chords than anyone since the Ramones. But there's a little extra here - the tight instrumental opening section of "Panic Song," the chunky minor groove of "Geek Stink Breath," the sinister plodding "Brain Stew," the subtle-but-impressive bass work behind "Stuart and the Ave." It's nothing that'll blow anyone's mind, but it adds enough flavoring that the whole thing avoids being a string of similar riffs throughout. (For more variety, try Nimrod.)