> Resonances (of time, distance, or orbital spacings) are quite common -- if something
> is out of resonance, gravity will gradually "pull" it into a resonance and, once it
> is there, there is nothing to shift it (any slight divergence will result in it
> being "pulled" back).

They are not just quite common, it is a requirement. Reality is not linear and energy stability can only be found within very specific quantum steps. As such, harmonic resonance is a requirement...

-wirelessguru1