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In music theory, an interval is a combination of two notes, or the distance between their pitches. Twonote combinations are also called dyads. Although chords are often defined as sets of three or more notes, intervals are sometimes considered to be the simplest kind of chord.^{[1]}
Intervals may be described as:^{[2]}
 Vertical or harmonic, if the two notes sound simultaneously
 Horizontal, linear, or melodic if they sound successively.
Intervals may be roughly classified as:
 Diatonic intervals, between the notes of a diatonic scale,
 Chromatic intervals, nondiatonic intervals between the notes of a chromatic scale,
 Minute intervals (commas, and microtones), sometimes so small that the difference in pitch between the two notes cannot be perceived.
 Interval quality: perfect, major, minor, augmented, diminished, and doubly augmented or diminished
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