90s Korn did enough to charm kids looking for something different from their rock music. On “Life Is Peachy,” the band does its best to represent their newfound fans. The fact is that, for the most part, the band’s admirers, just like Head, Munky, Fieldy, David Silveria and, especially, singer Jonathan Davis, are troubled. “Life Is Peachy” had fewer strong songs than the first record but did enough to bolster the band’s global brand.