So, my lady recently showed me this. The claim is that if you slow down a recording of crickets, you get what sounds like beautiful choir music. I've reviewed snopes on this, and some other sites, and it is a bit up in the air. It does seem to be true that you can get human-like vocal sounding tones from crickets. This recording is beautiful at the very least.
https://youtu.be/UqU5OMNL-7I