or music theory
, the supertonic
is the second degree
of the scale
. For example, in the C major scale
(white keys on a piano), the mediant is the note D; and the supertonic chord
uses the notes D, F, and A. In music theory
, the supertonic chord is symbolized with the Roman numeral
II if major or ii if minor.
"Supertonic" also refers to a relationship of musical keys. For example, relative to the key of C major, the key of D major is the mediant. Modulation (changes of key) to the mediant are relatively rare, compared with, say, modulation into the dominant.