Key Points
- Harmony describes the vertical events in music.
- A chord is the simultaneous sounding of three or more pitches; chords are built from a particular scale, or sequence of pitches.
- The most common chord in Western music is a triad, which has three notes built on alternate pitches of a scale.
- Most Western music is based on major or minor scales, from which melody and harmony are derived.
- The tonic is the central tone around which a melody and its harmonies are built; this principle of organization is called tonality.
- Dissonance is created by an unstable, or discordant, harmony, while consonance occurs with the resolution of dissonance, producing a concordant sound.
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