Bernie Krause has pointed a microphone at ants eating and sand dunes shifting, but the detail that sticks is the corn: he sat in an Iowa field for two August nights and recorded the stalks telescoping upward fast enough to pop and squeak audibly around midnight. This is his how-to for anyone who wants to try it themselves — where to point a small recorder and what patience actually sounds like. The 2016 Yale University Press revision drops the original CD in favor of links straight to the recordings.