Hard rock bands have kept heavy music vibrant in a new century by sustaining a sense of danger, like they’re driving race cars with the brakes cut. Boris and Lightning Bolt flirt with outright noise, ignoring tidy song structures to follow the Pied Piper of pealing feedback and clattering drums over a cliff. Mclusky builds tension almost entirely through Andy Falkous’ psychotic scream-singing; Deerhoof somehow channels even more chaos by making Satomi Matsuzaki the calm, implacable center of their whirlwind.