Bernie Krause has recorded jaguars growling, frogs chorusing at dawn, singing cottonwood trees, and groaning glaciers. A naturalist and pioneer in the emerging discipline of soundscape ecology, he has traveled the globe from the Arctic to the Amazon, making what he calls “whole-habitat” field recordings of wild places threatened by climate change, commercial development, and industries such as mining and logging. Every site he’s recorded, he says, has a defining sound signature as unique as any musical composition.