Dyads are two note intervals, a more stripped down "chord" than triads. Let's pair the G note with the 12 notes of Western music and see what happens:
G + G = G (root) - either same note or octaves, depending on the octave of the notes
G + Ab = Abmaj7 (no 3rd, no 5th) - less dissonant in different octaves
G + A = Gsus2 (no 5th) or A7 (no 3rd, no 5th)
G + Bb = Gm (no 5th)
G + B = G (no 5th)
G + C = Gsus4 (no 5th) or C5
G + Db = G(b5) or Gdim (no 3rd) or Db(b5) or Dbdim (no 3rd)
G + D = G5
G + Eb = Eb major (no 5th)
G + E = G6 or Em (no 5th)
G + F = G7 (no 3rd, no 5th)
G + F# = Gmaj7 (no 3rd, no 5th) - less dissonant in different octaves
So when would you use or implement a Dyad? I suppose as a riff or trill or fill?
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