G.I. Gudjieff said the Logos was the first and deepest sound that came before the word. The sound is the world's tonic note. An audible echo of the sound can be produced because every octave is a replica at a different level of every other octave...

The deepest sound that our ears can hear has a frequency of 20 cycles per second with each wave of that sound passing by in 1/20th of a second. The sound discovered in the black hole of the Perseus cluster is one million, billion times lower than the lowest sound audible to the human ear with each wave of that sound occuring once every 10 million years; the ultimate meditative cosmic om.