While reading about the Ishaya monks, I downloaded and listened to one of their introductory talks. Somewhere around the middle of the recording, I heard what I took to be music, albeit seemingly poorly recorded. I could hear crickets in the background of what sounded like a choir of human voices making "La" or "Ah" sounds in progressive chords, much like a church hymn. The whole thing was strangely "noisy" sounding, but also rather haunting. It was then the person on the recording spoke up and said,

What you are hearing is the recording of crickets. There are two tracks. One is played at regular speed and the other is a slowed-down version.... The sounds are slowed down to the equivalent of a human lifespan. What you are hearing are the crickets only. No instruments or voices are added.

I have sincerely never heard anything so amazing in my life.