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In music a mixed-interval chord is a chord not characterized by one consistent interval. Chords characterized by one consistent interval, or primarily but with alterations, are equal-interval chords. Mixed interval chords "lend themselves particularly" to atonal music since they tend to be dissonant.

Equal-interval chords are often of indeterminate root and mixed-interval chords are also often best characterized by their interval content. "Equal-interval chords are often altered to make them 'impure' as in the case of quartal and quintal chords with tritones, chords based on seconds with varying intervals between the seconds."

References

1. Reisberg, Horace (1975). "The Vertical Dimension in Twentieth Century Music", p.371, Aspects of Twentieth-Century Music, chap. 5, p.362-72. Wittlich, Gary (ed.). Englewood Cliffs, New Jersey: Prentice-Hall. ISBN 0-13-049346-5.
2. ^ Reisberg (1975), p.362.

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By form	Triad Major Minor Augmented Diminished Suspended Seventh Leading-tone Major Minor Dominant Dominant seventh flat five Diminished Half-diminished Diminished major Minor-major Augmented major Augmented minor Altered seventh Nondominant Harmonic seventh Extended Ninth Eleventh Thirteenth Upper structure Dominant 7♯9 Polychord Tone cluster Added / omitted Sixth Augmented sixth Lydian Seven six Specific Alpha Bridge Complexe sonore Dream Elektra Farben Grandmother Magic Mystic Northern lights Petrushka Psalms So What Tristan Viennese trichord General Mixed interval Secundal Tertian Quartal Synthetic chord Tetrad
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