1999 was an inexplicable time for rock. Nu metal was ascendant. At least “Bawitdaba” can be appreciated for its insanity, but we are all wondering what we were thinking with the “Nookie.” But Korn (of all bands) have actually stood the test of time. “Freak on a Leash” is a legitimately great song, and in 2015 it is still revealing its depth and power.