Mixed-interval chord

File:Schoenberg Klavierstuck op. 33a mixed-interval chords.png

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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.

File:Interval cycles C1-C4 and C6.PNG

Interval cycles: C1–C4 and C6; feature equal-intervals.

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."