<<<--- Pan, the Greek horned God holding his flute (yes; Panpipes...) where each pipe or tone represents the orbit of one of the (then known) 7 Planets...
This flute he made from the reeds that resulted from him chasing the Woman he lusted after: Syrinx, transforming herself into those reeds to hide from his persistance.
Pan played this flute in mourning ever since.
But that's a whole different story, -as far as I know- not having anything to do with
Harmony of the Spheres.