Everything Shearwater does is as grand and beatific as it is devastating and sobering, much like the natural world their music so vividly reflects. The Golden Archipelago is the closing chapter of a trilogy that includes 2006's Palo Santo and '08's Rook. Island life -- the isolation, tranquility and decay of it -- is the central theme. Rumbling percussion, piano and guitar build, tumble and collide like a hurricane, as acoustic plucks and operatic cries summon the storm's finale and ensuing calm. Think Sounds of Nature with a human heart and an indie-rock soul.