The notes are from the circle of fifths, which is a result of the harmonic series. Unfortunately, there is a hole in reality that Pythagoras discovered that makes all possible scales out of tune. This was the central secret in the Pythagorean mysteries.
These are thinking, feeling, beings, dependent on us. They evolved as aids in hunting, protectors of our families and our resources, hunters of the vermin that invades our storehouses, protectors of our livestock, and our companions. You just have a very restricted definition of family. Myself, I’m richer for being a bit more expansive, with family of choice. I suspect that’s true of many of the readers of this strip.
Remember, remember, the fifth of November