A 6th Added 9th

A6add9

Notes

A · C# · E · F# · B

Intervals

  • RootA (1P)
  • Major 3rdC# (3M)
  • Perfect 5thE (5P)
  • Major 6thF# (6M)
  • Major 9thB (9M)

Fretboard

EBGDAE357912EF#ABC#EBC#EF#ABABC#EF#EF#ABC#ABC#EF#AEF#ABC#E

About

The A6/9 (A–C♯–E–F♯–B) combines the warmth of the 6th with the openness of the 9th, deliberately omitting the 7th. This keeps the chord stable and resolved — unlike extensions that include a 7th, it does not imply harmonic motion. It is a rich tonic color used in jazz, R&B, and gospel as a final or resting chord. Both the F♯ and B are essential to the sound; the 5th can be omitted in compact voicings. On guitar, spread voicings that separate the 6 and 9 allow both extensions to speak clearly without muddiness. Compared to AMaj9, the 6/9 is warmer and more grounded; compared to Aadd9, fuller.

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