Sound waves are not part of the electromagnetic spectrum. They are however, an example of radiant energy,- and aside from their different nature and propagation velocities, are remarkably similar to Light waves. Sound waves propagate at 313 meters per second while light waves propagate at 300 Thousand Kilometers per second. Sound waves are "matter disturbances" where a group of molecules or atoms jostle their neighboring molecules or atoms on the side away from the molecules or atoms that jostled them.

The most important thing sound waves have in common with Light waves is that both types of wave are detectable by highly developed organs in our human bodies. These organs report to special areas of our brains where we percieve the world through the audio and visual clues we hear and see.

Color theory is to light as Music theory is to sound. Music theory is hundreds if not thousands of years older than Color theory. Both theories deal with our perceptions of radiant waveform energy. Perhaps one theory will provide an insight that will give us a better understanding of the other.

Music theory tells us which audio frequencies sound pleasant when mixed with other audio frequencies; How far apart the center frequency for one note must be from the center frequency of the next note for the human ear to detect the change in pitch, and how many notes are required before the first note is doubled in frequency. It turns out that there are 8 distinct pitch changes in every frequency doubling range. Thus there are 6 notes between a note and its double in frequency. The entire group of notes is called an Octave.