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(in C: D-F-A-C). One variant of the supertonic seventh chord is the supertonic diminished seventh with the raised supertonic, which equals the lowered third through enharmonic equivalence (in C: D=E).

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:

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