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      Chords · Multiple notes struck simultaneously 
           Theory · Theory 
           Triads · Chords constructed from the scale intervals 1, 3 & 5 
           Sevenths · Chords constructed from the scale intervals 1, 3, 5 & 7 
           Sixths · Chords constructed from the scale intervals 1, 3, 5 & 6 
           Ninths · Chords constructed from the scale intervals 1, 3, 5, 7 & 9 
           Elevenths · Chords constructed from the scale intervals 1, 3, 5, 7, 9 & 11 
           Thirteenths · Chords constructed from the scale intervals 1, 3, 5, 7, 9, 11 & 13 
           Quartals · Chords built on the interval of the fourth 
           Substitutions 
           Chord Relations for Common Voicings · Relationships between chords 
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