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The supertonic may be raised as part of the common-tone diminished seventh chord, ♯ ii o 7 (in C: D ♯ –F ♯ –A–C). One variant of the supertonic seventh chord is the supertonic diminished seventh [3] with the raised supertonic, which equals the lowered third through enharmonic equivalence (in C: D ♯ =E ♭).
This triad is consequently called the supertonic diminished triad. Like the supertonic minor triad found in a major key, the supertonic diminished triad has a predominant function, almost always resolving to a dominant functioning chord. [7] If the music is in a minor key, diminished triads can also be found on the raised seventh note, ♯ vii o.
minor triads contain a minor third with a major third stacked above it, e.g., in the minor triad A–C–E (A minor), A–C is a minor third and C–E is a major third. diminished triads contain two minor thirds stacked, e.g., B–D–F (B diminished) augmented triads contain two major thirds stacked, e.g., D–F ♯ –A ♯ (D augmented).
There are four basic triads (major, minor, augmented, diminished). They are all tertian —which means defined by the root, a third, and a fifth . Since most other chords are made by adding one or more notes to these triads, the name and symbol of a chord is often built by just adding an interval number to the name and symbol of a triad.
The harmonic major scale may be used to construct the following chords, which also may be thought of as borrowed from the parallel minor: the dominant minor ninth chord, the fully diminished seventh leading tone chord, the supertonic diminished triad, the supertonic half-diminished seventh chord, and the minor subdominant.
Diminished Secondary supertonic chord: ... Primary triad; Quartal chord; Root (chord) Seventh chord; Synthetic chord; Thirteenth chord; Tone cluster; Triad (music)
In a major key, the supertonic triad (ii) is minor, and in a minor key it is diminished. The dominant is, in its normal form, a major triad and commonly a dominant seventh chord. With the addition of chord alterations, substitutions, and extensions, limitless variations exist on this simple formula.
The chord notation for the diminished seventh chord (assuming root C) is Cdim 7 or C o 7 (or Cm 6 ♭ 5 for the enharmonic variant). The notation Cdim or C o normally denotes a (three-note) diminished triad, but some jazz charts or other music literature may intend for these to denote the four-note diminished seventh chord instead.