musictheory_cov

14. It is obvious that as well as finding the SIZE of the interval, you must also find
    the QUALITY of the interval whether it be major, minor, perfect, augmented, or
    diminished.


15. A second can generally be major or minor. A second is rarely diminished or
    augmented. A major second is always composed of a distance of one tone
    between two notes. On the other hand, the distance of a minor second is
    composed of only one diatonic semitone.

minor second major second

(^1) / 2 tone (^1) / 2 tone (^1) / 2 tone (^1) / 2 tone 1 tone 1 tone 1 tone 1 tone

16. A third can generally be major or minor. For it to be major the distance is one
    tome and a half. For easier calculation, refer to the lower note of the interval as
    your tonic. If the highest note is the mediant of the major scale, then the interval
    is a major third. The same procedure applies if it is a minor third.

major third minor third

Corresponds

to the key of:

Note:Consider all intervals as if the lowest note is the tonic of the major scale

Note:As previously mentioned, the quality of the third determines the major or minor mode.

C major F major E major Abmajor C minor F#minor A minor E minor

Intervals of Seconds and Thirds.