A previous post says the pentatonic scale comes from the circle of 5ths. And it does. But that's like saying Shakespeare's plays come from the alphabet. They do--but that's only one aspect. The alphabet is the coding material for the expression on the physical level, but on other levels like emotional and spiritual, the meaning comes from elsewhere.
If you want to go Kabbalistic you can; start decoding the secret frequencies of each letter (or note). And I'm not knocking that, because the more levels are combined, the more powerful the Art. It's said that the 5 books of Moses (aka the Torah, aka first five books of the Old Testament) are completely encoded with secret meanings.