Uploaded November 2022 | Updated September 2026, 3 weeks ago

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We cover the add9 (and ♭9 and ♯9) chords, with all the triad and ninth combinations, revealing a spectrum from floating, gossamer chords to those hurtling toward annihilation.

Add nine chords are a simple yet potent way to thoroughly transform the character of the basic triads. At the same time, we broach an important point about voicing and enharmonic spelling and the subsequent effect on name and implied function of chords.

Any additional questions on Add 9 chords, feel free to ask in the comments.

--Music theory prerequisites--

Intervals: youtu.be/dXg8eCHNaTE
Triads (part 1): youtu.be/K00Ivb20yWA
Sevenths (part 2): youtu.be/rVriHe--Lt8
Sus (part 3): youtu.be/95bDKPKkFuo

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