...the faster it vibrates, the higher the frequency (
http://en.wikipedia.org/wiki/Frequency). Now, you're partially right, there is no such thing as "sound," there are only frequencies. We "hear" some of them because our ears have the ability to resonate to the range of the frequency (by the way, I was off with my sound range approximate...it is more like 20 Hz - 20,000 Hz...bats, on the other hand, can "hear" up to 100,000 Hz).
Matter is referred to in terms of "sound" because the whole universe is an essentially musical structure, which is typically associated with sound. Whereas we "hear" in approximately 10 octaves, we "see" barely 1 octave of color (think of Mr. Roy G. Biv of rainbow fame - Red; Orange; Yellow; Green; Blue; Indigo; Violet - there are various hues/frequencies lying between the two extremes, but no "octave" of Red that we can see). I'm not speaking specifically about 2012 here, just current scientific knowledge.
Also, if you watched the video, you'll remember the part where that sound-table "shaped" the "matter" (the sand) into various "patterns" (a phenomenon called "cymatics"). The shapes changed accordingly as sound pitch was increased. This should give you an idea about sound's underlying role in the structure of matter (just think of it on the sub-atomic scale...i.e. compare the shapes of the sand to the structure of molecules and atoms). For example, one interesting fact is that the "color" orange-red has a direct influence on the process of cell division. Here was the experiment:
Professor Max Luscher hypothesized that the growth of testes in drakes can be controlled by the use of color. Two groups of drakes were kept under different colored lights in otherwise identical conditions. The testes of drakes reared beneath an orange-red light grew twice as fast as those of drakes kept below pale blue light.
Of course, this doesn't really mean the orange-red "color" had an effect at all, but the frequency at which the color vibrates. If nothing else, I guess, now we know how to create male ducks with gigantic balls.
You seemed to appreciate Pharaoh's explanation more, so I'll put in those terms. There are three parts to the equation - electrons (the particles that give all infinitesimally small atomic nuclei a hard, voluminous shell), photons (light quanta...sub-atomic components classified as "virtual" particles, which means they have no measurable mass), and us (the observer...or, more specifically, our nervous system). These interact in an interconnected dance of energy. The photons interact with the electrons, then send signals to our nervous system, which "creates" the measurable world we perceive. The observer and observed are integral functions of the same phenomenon. Without the participation of an observer, it seems, "particles" as such don't exist (like in "Married with Children...", you can't have one without the other).
Color is not "in" objects, but "in" the inter-action of our senses with objects. What we call "temperature" is actually the role of movement of molecules and our "feeling" of that movement. We manufacture all "material things" out of an ever-changing deluge of photons and electrons out there in the void. The human nervous system (including the brain) encounters and endures literally hundreds of millions of electrons and photons every minute (conservatively). The models which compose our experienced "reality" always exclude more than they include.
"Reality" may better be considered as flowing and meandering. Like a river. Or interacting, like a dance. Or evolving, like life itself. And as we evolve, we reach higher "notes" on the "scale" (or, climbing the "ladder" of evolution). Light, it would seem, is the most vibrant of all phenomena, the one that acts as the catalyst of our evolution. I think that's the same idea as some of this 2012 stuff, it understands the following sentiments:
"If it vibrates it can be tuned. Everything is energy - violins, people, potato chips, thoughts, feelings, and events. They all vibrate."
and
"With transcendental evolution, a harmonious individual is like a fully evolved octave and is capable, through the final "note" Do, of striking a single new note, into a greater scale above."