The other night I went out on my porch, and for a moment I thought I heard… a chorus of small frogs. I had to interrupt myself a few times in sequence because I know there are (very few, if any) frogs nearby. So my ears were telling me ‘frogs are singing(!)’ and my mind was telling me, ‘no, that’s (almost certainly) not what it is’. Even if there »were a frog or two nearby, there wouldn’t be a chorus.

Then my mind leapt up a rung or two on the ladder…

I realized that it ‘was’ the sound of water flowing through a pipe; ostensibly, a vertical pipe. Probably from the upstairs kitchen sink.

And.

The next moment…

It hit my mind like a shockwave of wonder, and truth…

That’s the sound of the frog chorus.

Water, flowing.

Adjusted for pitch, inflected by situation, species and time…

Those frogs are »literally singing the flowing water songs.

Later, I had the kitchen tap on low for a moment, and the water was trickling out into the drain, very musically…

And if you just slowed it down, you’d have something strikingly similar to a bullfrog’s ‘croaking’. Raise the pitch and it resembles a tree-frog chorus.