Composer Jim Wilson slowed down a recording of crickets singing and was amazed to find it sounded like human singing.
You can purchase a copy of Wilson’s album featuring the chorus of crickets via Amazon.
UPDATE: Some have claimed Wilson’s recording must incorporate actual human voices as well as cricket sounds. Music producer Dave D’aranjo, for example, tried to reproduce the sound and figure out what conditions would be required for it to be possible.
He concludes: “Look, Mr. Wilson’s original is no doubt relaxing and sounds pretty and I used it to help me sleep once. But it is undoubtedly a human singing, or perhaps a manipulated choir loop.” See D’aranjo’s reasoning here.
*Image of a cricket via Shutterstock