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Dyad

A two-note chord, whether played together or arpeggiated, forming the simplest harmonic unit on the guitar.

A dyad is any pair of notes, but on guitar it usually means a deliberate two-note shape chosen for its interval: a third, a sixth, an octave, or the hollow root-and-fifth of a power chord. Dyads are useful because they imply harmony without stating a full chord, so they leave room for a singer or another instrument. Rock players favour fifths and octaves for their neutrality, while country and jazz players use thirds and sixths for their warmer, more melodic colour.

Example: A riff built by moving the same root-and-fifth shape around the neck is made entirely of dyads.

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