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In music theory, a trichord (/ t r aɪ k ɔːr d /) is a group of three different pitch classes found within a larger group. [2] A trichord is a contiguous three-note set from a musical scale [3] or a twelve-tone row.
In music theory, a Viennese trichord (also known as Viennese fourth chord and tritone-fourth chord [2]), named for the Second Viennese School, is a pitch set with prime form (0,1,6). Its Forte number is 3-5. The sets C–D ♭ –G ♭ and C–F ♯ –G are both examples of Viennese trichords, though they may be voiced in many ways.
Also in jazz harmony, the tritone is both part of the dominant chord and its substitute dominant (also known as the sub V chord). Because they share the same tritone, they are possible substitutes for one another. This is known as a tritone substitution. The tritone substitution is one of the most common chord and improvisation devices in jazz.
A common type of three-chord song is the simple twelve-bar blues used in blues and rock and roll. Typically, the three chords used are the chords on the tonic, subdominant, and dominant (scale degrees I, IV and V): in the key of C, these would be the C, F and G chords. Sometimes the V 7 chord is used instead of V, for greater tension.
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