See pitch (music) for a discussion of historical variations in frequency. When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the F ♯ above middle C (or F ♯ 4) is approximately 369.994 Hz. when expressing a note that is functioning as a raised or lowered note, you use the same letter name as the diatonic note you are raising or lowering. Another enharmonic note is E (E-double sharp). G ♭ is a major third below B ♭, whereas F ♯ is a major third above D (a minor third below A). The notes in the 3rd beat of the first bar are D F sharp A. Looking closely at the notes, there should be no doubt that this is G major: The first two beats outline the notes of G major: G B D. However, in some temperaments, it is not the same as G ♭. According to our table of key signatures that means that this can either be G major or E minor. It lies a chromatic semitone above F and a diatonic semitone below G, thus being enharmonic to sol bémol or G ♭ (G-flat). F ♯ ( F-sharp also known as fa dièse or fi) is the seventh semitone of the solfège.
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