F#ma7#9 Major 7th
The F#ma7#9 chord is built from the notes F# – A# – C# – E# – G##.
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Also known as
F#ma7add#9F#maj#9F#maj7add#9
Chord tones, one by one
F#Root
Root
The fundamental note the chord is built on — F#.
A#Third
Major third
Four semitones — makes the chord major (brighter, happier).
C#Fifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
E#Seventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
G##Extension
Sharp ninth (♯9)
A ♯9 — the gritty 'Hendrix' tension over a dominant chord.
🎼 Related scales
Lydian ♯2harmonic minor a major 3rd below
🎹 Modal analysis
This chord implies the Lydian ♯2 scale; its characteristic note is the ♯2 / ♯9 (augmented 2nd). It is a mode of the harmonic minor a major 3rd below.
🎸 Genres
Gypsy jazz · Roma music · Klezmer · Classical