G♭ (musical note)
Musical note / From Wikipedia, the free encyclopedia
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G♭ (G-flat; also called Ges or sol bémol) is the seventh semitone of the solfège.
It lies a diatonic semitone above F and a chromatic semitone below G, thus being enharmonic to F♯ (F-sharp) or fa dièse. However, in some temperaments, it is not the same as F♯. G♭ is a major third below B♭, whereas F♯ is a major third above D (a minor third below A).
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the G♭ semitone is approximately 369.994 Hz.[1] See musical pitch for a discussion of historical variations in frequency.