The Architecture of Music

Chords

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The Underlying Architecture of Chords

Chord Interval Diagram

As can be seen above, the E maj3 is comprised of the E, G#, and B notes as the maj3’s 4 3 5 chord formula dictates, as shown by the notes along the right side of the interval diagram. All intervals have names. As can be seen on the left side of the interval diagram above, an interval of four semitones is a maj3 (M3) and an interval of seven semitones is a perfect 5th (P5). All chords work in this manner. Their formulas describe the notes to be played starting from any bass note. They do not describe the specific pitch of the notes to be played as in standard musical notation. They simply tell us the notes in a chord starting from any bass note.