The Note F#/Gb

F#/Gb as a musical pitch: its frequency, spellings, and the harmony built on top of it.

F#/Gb is the tritone — exactly halfway through the octave from C. This symmetrical position gives it a restless, unresolved quality that is central to dominant seventh chords and blues harmony. Its reference octave pitch is 369.99 Hz (MIDI note 66). The major triad on F# is F#/Gb Major (F# – A# – C#), and the minor triad is F#/Gb Minor (F# – A – C#).