@davisjames , if the cicadas are singing in the note of E, then they should harmonize nicely in a 'fifth' interval with the key of A. (Think of how fiddles are sometimes cross-tuned to AEAE) Can you test this theory by playing something in the key of A against your cicadas? Also, supposedly most telephone landline dial tones are set to the note of A, so that would be an interesting test as well, to see if they harmonize well together. 👂🏼 🙌🏻
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