A# 7♭5♭9 - CHARANGO

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Chord composition

I III ♭V ♭VII ♭IX
Root Major third Diminished fifth Minor seventh Minor ninth
A# D E G# B

ALL ABOUT THE A# 7♭5♭9 CHORD

Chord Composition

The A# 7♭5♭9 chord is composed of 5 notes :

  • A# (Root)
  • D (Major third)
  • E (Diminished fifth)
  • G# (Minor seventh)
  • B (Minor ninth)

These notes form an ultra-altered chord combining diminished fifth and minor ninth.

How to play A# 7♭5♭9 on charango

The 7b5b9 chord A# 7♭5♭9 combines two descending alterations: diminished fifth (b5) and minor ninth (b9).

  • Maximum tension: both alterations create extreme instability
  • Bebop and modern jazz: ultra-altered dominant
  • Powerful resolution: strongly calls for resolution
  • Half-whole scale: comes from symmetrical diminished scale

This is one of the most tense altered chords, combining two diminutions that create maximum dramatic tension.

Bebop voicings

Techniques for 7b5b9:

  • Without root: 3-b5-7-b9 highlights tensions
  • Tritone substitution: can replace another dominant chord
  • Diminished scale: improvisation with half-whole scale

Common uses of A# 7♭5♭9

The 7b5b9 chord creates intense resolutions:

  • Bebop: ultra-altered dominant in turnarounds
  • Modern jazz: maximum tension before resolution
  • Complex substitution: replaces V7 for dramatic effect

Styles

Bebop: most tense altered dominant.

Modern jazz: dramatic and intense resolutions.

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