Final answer:
Dissonance is the combination of pitches creating harmonic tension and an unfinished sound in music, which contrasts with consonance that provides a sense of resolution and stability.
Step-by-step explanation:
The sounding of a combination of pitches that creates harmonic tension and sounds unfinished is known as Dissonance. This occurs in music when pitches are combined in ways that clash or feel unstable, and this tension requires resolution to a stable or consonant state to feel complete.
The discordance, for example, can be created when playing three adjacent keys on a piano, such as F, F-sharp, and G, which would produce frequencies of 349, 370, and 392 Hz, resulting in beat frequencies and a dissonant sound experience.
In contrast, Consonance is the opposite, where the combination of pitches results in harmony and a sense of stability and rest.