Acombination of tones that sounds discordant, unstable, or in need of resolution is called a:

A combination of tones that sounds discordant, unstable, or in need of resolution is called a dissonance. A dissonant tone is unstable, where it creates a tension which requires an onward movement to a chord which is stable. These chords are active and are associated with expressions of conflict, hurt and sorrow.

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