Chord Structure
Building on each of the major scale degrees the 13th chord chord quality that is harmonic to such scale ((i.e. with all its notes belonging to such scale), results in the following table. The numbering is relative to the scale degree numbers of the major scale that has the major scale degree in question as tonic:
| Chord Root | Chord Quality | 1 | 3 | 5 | 7 | 9 | 11 | 13 |
|---|---|---|---|---|---|---|---|---|
| I | maj13 | - | - | - | - | - | - | - |
| ii | m13 | - | ♭ | - | ♭ | - | - | - |
| iii | m7♭9♭13 | - | ♭ | - | ♭ | ♭ | - | ♭ |
| IV | maj13♯11 | - | - | - | - | - | ♯ | - |
| V | 13 | - | - | - | ♭ | - | - | - |
| vi | m7♭13 | - | ♭ | - | ♭ | - | - | ♭ |
| viio | 7ø♭9♭13 | - | ♭ | ♭ | ♭ | ♭ | - | ♭ |
Other 13th chord qualities do exist but they do not belong to any scale mode.
From the table it is clear that adding an 11th or a 13th makes the seven chord qualities distinguishable from each other, as without an 11th added the I and IV chord quality would be identical, and without a 13th added the ii and vi chord quality would be identical.
Read more about this topic: Extended Chord
Famous quotes containing the words chord and/or structure:
“The notes, random
From tuning, wander into the heat
Like a new insect chirping in the scrub,
Untired at noon. A chord gathers and spills....”
—Philip Larkin (1922–1986)
“Agnosticism is a perfectly respectable and tenable philosophical position; it is not dogmatic and makes no pronouncements about the ultimate truths of the universe. It remains open to evidence and persuasion; lacking faith, it nevertheless does not deride faith. Atheism, on the other hand, is as unyielding and dogmatic about religious belief as true believers are about heathens. It tries to use reason to demolish a structure that is not built upon reason.”
—Sydney J. Harris (1917–1986)