One simple type of chord substitution is to replace a given chord with a chord that has the same function. Scott DeVeaux describes a "penchant in modern jazz for harmonic substitution." The substitute chord must have some harmonic quality and degree of function in common with the original chord, and often only differs by one or two notes. Jazz musicians often substitute chords in the original progression to create variety and add interest to a piece. ![]() Unlike the dominant triad or dominant seventh, the leading-tone triad functions as a prolongational chord rather than a structural chord since the strong root motion by fifth is absent. Since the triad is built on the seventh scale degree, it is also called the leading-tone triad. ![]() For instance, in the key of C, this is a B diminished triad (B, D, F). In major scales, a diminished triad occurs only on the seventh scale degree. ![]() The diminished triad can be used to substitute for the dominant seventh chord. Bach's Well-Tempered Clavier I, Prelude in G major. Diminished triad substituting for dominant chord in J.
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