G♯ (musical note)
Sol Dièse or G# (G sharp) is the ninth semitone of the solfege.
It lies a chromatic semitone above G and a diatonic semitone below A, thus being enharmonic to La Bémol or A♭ (A flat). However, in some temperaments, it is not the same as A-flat. A-flat is a perfect fifth below E-flat, whereas G sharp is a major third above E. Thus A♭ is slightly lower in pitch.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the G♯ semitone is approximately 415.305 Hz. See pitch (music) for a discussion of historical variations in frequency.
G# / A♭ is the only note to have only one other enharmonic.
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