Minor (Latin: smaller) is used in musical terminology to describe a form of scale that corresponds, in its natural form, to the Aeolian mode: the scale on the white notes of the keyboard from A to A. Two other forms of the minor scale are commonly used: the melodic minor and the harmonic minor. The melodic minor scale is a form of minor scale that uses the natural minor form descending, but sharpens the sixth and seventh degrees when ascending. The harmonic minor scale uses the natural minor with a sharpened seventh degree when ascending and descending. The intervals between the first note or tonic (key-note) and the third, sixth and seventh degrees of the natural minor scale are described as minor (that is, C to E flat , a minor third; C to A flat, a minor sixth; C to B flat, a minor seventh). C to D flat forms a minor second. A minor chord or minor triad consists of a bottom note with a note a minor third above, and, optionally, a note a perfect fifth above the bottom note. In this way the chord or triad C – E flat – G is described as minor.