It might seem a bit incongruous to say that Led Zeppelin—a band never particularly known for its tendency to understate matters—has produced an album [#&@%] which is remarkable for its low-keyed and tasteful subtlety, but that's just the case here. The march of the dinosaurs that broke the ground for their first epic release has apparently vanished, taking along with it the splattering electronics of their second effort and the leaden acoustic moves that seemed to weigh down their third. What's been saved is the pumping adrenaline drive that held the key to such classics as "Communication Breakdown" and "Whole Lotta Love," the incredibly sharp and precise vocal dynamism of Robert Plant, and some of the tightest arranging and producing Jimmy Page has yet seen his way toward doing. If this thing with the semimetaphysical title isn't quite their best to date, since the very chances that...