{{Short description|Tonal degree of the diatonic scale}} {{for|the 2020 Diana Ross remix album|Supertonic: Mixes}} {{Image frame|content=<score vorbis="1" lang="lilypond"> { \override Score.TimeSignature #'stencil = ##f \relative c' { \clef treble \time 7/4 c4 \once \override NoteHead.color = #red d e \once \override NoteHead.color = #red f g \once \override NoteHead.color = #red a b \time 2/4 c2 \bar "||" \time 4/4 <d, f a>1 \bar "||" } } </score>

<score vorbis="1" lang="lilypond"> { \override Score.TimeSignature #'stencil = ##f \relative c' { \clef treble \time 7/4 c4 \once \override NoteHead.color = #red d es \once \override NoteHead.color = #red f g \once \override NoteHead.color = #red aes bes \time 2/4 c2 \bar "||" \time 4/4 <d, f aes>1 \bar "||" } } </score>|width=310|caption=The scale and supertonic triad in C major (top) and C minor (bottom).}}

In music, the '''supertonic''' is the second degree ({{music|scale|2}}) of a diatonic scale, one whole step above the tonic.<ref>Benward & Saker (2003). ''Music: In Theory and Practice, Vol. I'', p. 32. Seventh edition. {{ISBN|978-0-07-294262-0}}. "One step above the tonic."</ref> In the movable do solfège system, the supertonic note is sung as ''re''.

The triad built on the supertonic note is called the '''supertonic chord'''. In Roman numeral analysis, the supertonic chord is typically symbolized by the Roman numeral "ii" in a major key, indicating that the chord is a minor chord (in C: D–F–A). In a minor key, it is indicated by "ii{{music|dim}}," indicating that the chord is a diminished chord (in C: D–F–A{{music|b}}). Because it is a diminished chord, it usually appears in first inversion (ii<sup>o6</sup>) so that no note dissonates with the bass note.

These chords may also appear as seventh chords: in major, as ii<sup>7</sup> (in C: D–F–A–C), while in minor as ii{{music|halfdim}}<sup>7</sup> (in C: D–F–A{{music|b}}–C) or rarely ii<sup>7</sup>. They are the second-most common form of nondominant seventh chords.<ref name="K&P 246">{{Cite book|title=Tonal Harmony|last1=Kostka|first1=Stefan|author1-link=Stefan Kostka|last2=Payne|first2=Dorothy|date=2004|publisher=McGraw-Hill|isbn=0072852607|edition=5th|location=Boston|pages=216|oclc=51613969}}</ref> <blockquote><score lang="lilypond"> { \override Score.TimeSignature #'stencil = ##f \relative c' { \clef treble \time 4/4 \key c \major <d f a c>1_\markup { \concat { "ii" \raise #1 \small "7" } } \bar "||"

\clef treble \time 4/4 \key c \minor <d f aes c>1_\markup { \concat { "ii" \raise #1 \small "ø7" } } <d f a c>^\markup { "rare" }_\markup { \concat { "ii" \raise #1 \small "7" } } \bar "||" } } </score> {| |thumb|120px|none|ii{{sup|7}} (first and third chords)||thumb|120px|none|ii{{music|halfdim}}{{music|7 chord}} (second chord) |} </blockquote>

[[File:Ii-V-I turnaround in C.png|thumb|Supertonic (ii) in ii–V–I progression on C, found at the end of the circle progressionFile:Ii-V-I turnaround in C.mid]]

The supertonic chord normally functions as a predominant chord, a chord that resolves to a chord with dominant function. The supertonic chord lies a fifth above the V chord. Descending fifths are a strong basis for harmonic motion (see circle of fifths). The supertonic is one of the strongest predominants.

[[File:Acorde de sexta napolitana.png|thumb|In C major: A Neapolitan sixth chord in first inversion contains an interval of a sixth between F and D{{music|flat}}File:Neapolitan sixth.mid]] [[File:Common-tone diminished seventh chord.png|thumb|right|Common-tone diminished seventh chord resolving to I{{music|6 chord}}File:Common-tone diminished seventh chord.mid]]

In major or minor, the major chord built on the lowered supertonic ({{music|b}}{{music|scale|2}}) is called a Neapolitan chord (in C: D{{music|b}}–F–A{{music|b}}), notated as N<sup>6</sup> or {{music|b}}II<sup>6</sup>, usually used in first inversion. The supertonic may be raised as part of the common-tone diminished seventh chord, {{music|#}}ii{{music|dim}}<sup>7</sup> (in C: D{{music|#}}–F{{music|#}}–A–C). One variant of the supertonic seventh chord is the supertonic diminished seventh<ref>Kitson, C. H. (2006). ''Elementary Harmony'', p. 43. {{ISBN|1-4067-9372-8}}.</ref> with the raised supertonic, which equals the lowered third through enharmonic equivalence (in C: D{{music|#}}=E{{music|b}}).

The term ''supertonic'' may also refer to a relationship of musical keys. For example, relative to the key of C major, the key of D major (or D minor) is the supertonic.

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

==References== {{reflist}}

{{degrees}}

Category:Diatonic functions 2 {{music theory stub}}