In music, a pair of simultaneous musical notes or a chord consisting of exactly two notes.
From Greek dicho- (two) + chord (from Greek chorde, string). In music theory, chord refers to multiple notes sounded together.
While a dichord (two-note combination) doesn't have the harmonic richness of three-note chords, medieval composers actually had complex rules about which two-note combinations were allowed, showing that musical rules were rigid long before modern harmony developed.
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