4355 / 18210 · Workshop 26 — “’Round Midnight”: Chromatic Melody, Diminished Color, Altered Dominants, and Making Dissonance Sound Beautiful← prev⊞ allnext →
26.36Level 10 — ♯9 color
G7♯9 contains:
A♯/B♭.
In jazz spelling/context, this is the altered 9.
So the chord can contain:
B natural = 3
B♭ = ♯9 sound.
That major/minor-third proximity is highly tense.