Supertonic

In music, the supertonic is the second degree () of a diatonic scale, one whole step above the tonic.

The supertonic is one of the strongest predominants and approaches the V chord from above by descending fifth.

The supertonic may be raised as part of the common-tone diminished seventh chord, ♯iio7 (in C: D♯–F♯–A–C).

The term supertonic may also refer to a relationship of musical keys.

In Riemannian theory, the supertonic is considered the subdominant parallel: Sp/T in major though sP/T in minor (A♭M).

ii 7 (first and third chords)
ii ø 7 (second chord)
Supertonic (ii) in ii–V–I progression on C, found at the end of the circle progression
In C major: A Neapolitan sixth chord in first inversion contains an interval of a sixth between F and D ♭
Common-tone diminished seventh chord resolving to I 6