I had an insight about the connection between scales and the universe. Take a note as a string. An octave up is half the length, and octave lower, double.
A pretty interval, or any integer interval (say one fifth of the length of our original string) will make a harmonious division, but, if this need to move up an octave, double or half that fifth, it will not fit with the other doubling or halving. This is why scales stop working and the equal temperament, which, today, divides the string into 12 equal parts is used, but it is imperfect.
I realised that in the universe and atomic vibrations, only classical, whole intervals can be possible which would limit harmonious vibrations. String theory and its relatives might be about vibrations, but in music, problems and interesting properties only arise in chords, for example, quantity of fifths, rather than individual notes or vibrational patterns.
