Example of piano tone clusters creating secundal chords, especially in the right hand (bottom) part, which features three notes each a second apart.
In music or music theory, secundal is the quality of a chord made from seconds, and anything related to things constructed from seconds such as counterpoint. Secundal chords are often referred to more generally as tone clusters, especially when non-diatonic. Chords which may be considered as built from sevenths, because of musical inversion, are actually secundal. Polychords may create secundal chords.
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