Some of my fondest memories are of hiking the Olympia National Forest in Washington State and the forests of the Shenandoah Valley in Virginia, seeking the kind of silence one can only find in busy ecosystems full of birds, insects, woodland creatures, rustling leaves, etc. This experience can be transformative, a full immersion in what acoustic ecologist Gordon Hempton calls a “natural acoustic system,” the endless interplay of calls and responses that evolved to harmonize over millennia.