F#

F#add9

Notes

F# · A# · C# · G#

Intervals

  • RootF# (1P)
  • Major 3rdA# (3M)
  • Perfect 5thC# (5P)
  • Major 9thG# (9M)

Fretboard

EBGDAE357912F#G#A#C#C#F#G#A#G#A#C#F#F#G#A#C#A#C#F#G#F#G#A#C#

About

The F♯add9 (F♯–A♯–C♯–G♯) adds a ninth to a major triad without including a 7th. The distinction matters: because there is no 7th, the chord stays harmonically stable and resolved rather than suggesting dominant or subdominant motion. The G♯ adds brightness and shimmer; the A♯ retains the major identity. On guitar, open-string voicings make add9 sounds particularly resonant. The 5th can be omitted without loss; the 3rd and 9th are both essential. Compared to F♯Maj9, add9 is simpler and more grounded — a major triad with a single added color. Compared to plain F♯, the 9th adds a touch of modern shimmer.

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