Section outline

  • The quality of seconds, thirds, sixths and sevenths is major or minor.

    Seconds

    Thirds




    Sixths and sevenths

    If interval includes one minor second, it's major sixth/seventh.. If it includes two minor seconds, it's minor sixth/seventh.



    Sixth compared to fifth:

    • Major sixth is fifth + M2 (major scale, C-A)
    • Minor sixth is fifth +m2 (minor scale, C-Ab)

    Seventh compared to octave:

    • Major seventh is m2 less than octave
    • Minor seventh is M2 less than octave