The Eyes of a Stranger

[Unbound]

You may find this description of Aum to be interesting.

http://www.srichinmoycentre.org/meditati...nce_of_aum

Also, harmony works a lot on the principle of interference patterns: http://en.wikipedia.org/wiki/Interferenc...opagation)

Now, in terms of audible sound waves, you are correct that frequency correlates with pitch, although not entirely. (from Wiki: Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psychoacoustical attribute of sound.) That being said, the "speed of sound", or a particular speed, could be thought of as one level of frequencies, with other speeds constituting other levels of frequencies.

Now, the "geometry" you speak of can also be thought of as a "phase", or a single cycle of a geometric configuration. Even if you look at cymatics, you'll see it's not a perfect thing, because it is motional, it moves, so the geometric design isn't static but a slightly fluctuating phase pattern.

http://en.wikipedia.org/wiki/Phase_velocity

Now, it is important to keep in mind that one WAVE, can have multiple frequency phases. Also, a single wave has within it multiple directions of movement, so one "sound" can't really be tied down to any one particular frequency, as pretty much every perceptible experience of sound involves many frequencies. Even if you use a frequency generator it isn't a pure frequency.