A combination of tones that is considered unstable and tense called a?

A combination of tones that is considered unstable and tense is called a dissonance.

Here's why:

* Dissonance: In music, dissonance refers to a combination of notes that sounds jarring, unpleasant, or unresolved. It creates a sense of tension and instability, often leading the listener to expect a resolution.

* Consonance: The opposite of dissonance is consonance, which is a combination of notes that sounds pleasing and stable.

Dissonance is a crucial element in music. It's used to create dramatic effects, build tension, and drive the music forward. The resolution of dissonance to consonance often provides a sense of satisfaction and release.