Chords that are constructed of consecutive (or "stacked") thirds are called tertian.A unique particularity of the minor chord is that this is the only chord of three notes in which the three notes have one harmonic – hearable and with a not too high row – in common (more or less exactly, depending on the tuning system used).This is the sixth harmonic of the root of the chord, the fifth of the middle note, and the fourth of the high note: Demonstration: In just intonation, a minor chord is often (but not exclusively) tuned in the frequency ratio 10:12:15 (playⓘ).[6] In 12-TET, or twelve-tone equal temperament (now the most common tuning system in the West), a minor chord has 3 semitones between the root and third, 4 between the third and fifth, and 7 between the root and fifth.[7] Ellis proposes that the conflict between mathematicians and physicists on one hand and practicing musicians on the other regarding the supposed inferiority of the minor chord and scale to the major may be explained due to physicists' comparison of just minor and major triads, in which case minor comes out the loser, versus the musicians' comparison of the equal tempered triads, in which case minor comes out the winner since the ET major third is 14 cents sharp from the just major third while the ET minor third closely approximates the consonant 19:16 minor third, which many find pleasing.
An illustration of the harmonic series as musical notation. The numbers above the harmonic indicate the number of
cents
it deviates from
equal temperament
. Red notes are sharp. Blue notes are flat.