The fields and gardens, the empty lots and woods, even the highway median strips – all  resound with insect music here at this time of year, as if thousands of soloists, chamber groups, quartets and jazz ensembles were hidden in the bush.  Whatever evolutionary purposes it serves, there is nothing utilitarian about our pleasure in this music. Even you, dear reader, are mortal and this sweet evanescent sound is for you.

The crickets and katydids produce their songs by rubbing their wings together, a method known as “stridulation.” A file on the bottom of one wing is rubbed against a scraper on top of the other wing. Thin membranes on the wings vibrate rapidly to produce the noise we hear. If not for the wings, the sounds would not resonate anymore than the sound of a finger scraped against a comb.

The cicadas have a pair of special sound-producing organs called “tymbals,” located at the base of the abdomen. Here is a wonderful website,  Songs of Insects, that describes the process. “Inside each tymbal are stiff but flexible ribs supporting a stout membrane. Muscles attached to the ribs pull the tymbal inward, causing it to pop. The tymbal pops again when the tension is released. Rapid contractions and relaxations of the tymbal muscles create the loud, buzzing songs of the cicadas, which are amplified further by a hollow area in the abdomen.”

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