• We have a natural affinity for thirds and fifths in music. 1-3-5 (c-e-g) and so forth. A c and d played together produces a sound that we call dissonance because it is "unusual" to our ears. It can also be quite music in a progression. The study thatr answers this sort of question is called "music theory" and there are some excellent introdutory books on the suject. I can give you more detail if you like.
  • 5-2-2017 A guitar string is fixed at both ends and the movement is greatest in the middle. The string produces a note which has a half wavelength equal to the length of the string. (Tuning changes the speed of sound through the string.) Now touch the string lightly at the 12th fret as you pluck it. Do it again touching the seventh fret, and again touching the fifth fret. These four notes are produced by one string because they all have nodes of zero motion at the end points of the string. Now another principle: two notes mix to produce a third note. Fret the second string at the fifth fret and pluck the first and second strings together. If they are not tuned correctly you will hear a note going "wah wah wah", which is the difference between the two frequencies. If they are perfectly tuned you will not hear that sound. So combinations of notes that all have their nodes together sound good, and combinations of notes that produce a "wah wah" effect are called discordant.

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