My experience was deeply spiritual, however not in a positive sense....anyways from this site: www.spiritsound.com...
Ancient teachings and modern science agree: you, I, all living things, all things in existence are made up at their most essential level of vibrating,
For millennia, mystics have recounted their experience of this energy, which is said to manifest in our hearing awareness as a humming vibration
around and within everything else.
In the Sanskrit tradition, this sound is called "Anahata Nada," the "Unstruck Sound." Literally, this means "the sound that is not made by two
things striking together." The point of this particular distinction is that all ordinary audible sounds are made by at least two elements: bow and
string; drum and stick; two vocal cords; two lips against the mouthpiece of the trumpet; the double reed of the oboe; waves against the shore; wind
against the leaves. All sounds within our range of hearing are created by things visible or invisible, striking each other or
vibrating together, creating pulsing waves of air molecules which our ears and brain interpret as sound.
So, sound that is not made of two things striking together is the sound of primal energy, the sound of the universe itself. Joseph Campbell likens
this unstruck vibration to the humming of an electrical transformer, or the (to our ears) unheard hummings of atoms and molecules.
And the ancients say that the audible sound which most resembles this unstruck sound is the syllable OM. Tradition has it that this ancient mantra is
composed of four elements: the first three are vocal sounds: A, U, and M. The fourth sound, unheard, is the silence which begins and ends the audible
sound, the silence which surrounds it.
There are several traditional and allegorical interpretations of this ancient sound.
Everything in the Universe vibrates, from the smallest particle, to the planets in our solar system, to the billions of stars in the Milky Way Galaxy,
creating patterns of geometric waveforms, frequencies, musical intervals, and sounds. In Western Culture, The Music of the Spheres, or the concept of
these heavenly harmonies can be traced back to 6th century BCE and Pythagoras, who recognized that sounds are subject to mathematical laws and
proportions, and were the very foundation of the Universe. In the Eastern Tradition the idea that sound is the generator of the universe, may date
back even further this belief is found in ancient texts from China and is fundamental to the Vedas and Hindus.