From what I remember of music theory, all music (at least Western music) boils down to scales that revolve around the 12 notes (circle of fourths/fifths). I know there are scales in different regions that have different combinations of those notes (many scales have 5 or 7 notes, some have 8, others like the chromatic have all 12, etc.).
But there are many more possible sounds than just those 12 notes (and the octaves created from those 12 notes). I don't know how many more sounds than notes, but it's probably a lot. So I'm wondering, if there are any musical scales / traditions / references on non-12-note musical systems. Say a musical system that has 13 notes before an octave is reached, or 100 notes, etc.