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Accidental raising the pitch of a note by one chromatic semitone (♯)
For the use of the sharp sign in mathematics, see
Musical isomorphism. For the use of the sharp sign in computational complexity theory, see
♯P.
"♯" redirects here and is not to be confused with the
number sign(#).
In music, sharp – eqv. dièse (from French) or diesis (from Greek δίεσις)[a] – means higher in pitch. The sharp symbol, ♯, indicates that the note to which the symbol is applied is played one semitone higher. The opposite of sharp is flat, indicating a lowering of pitch. The symbol derives from a square form of the letter b.
The sharp symbol is used in key signatures or as an accidental applied to a single note. Below is a staff with a key signature containing three sharps (A major or F♯ minor) and a sharp symbol placed on the note, indicating that it is an A♯ instead of an A♮.
In twelve-tone equal temperament tuning (the predominant system of tuning in Western music), raising a note's pitch by a semitone results in a note that is enharmonically equivalent to another named note. For example, E♯ and F would be equivalent. This is not the case in most non-standard tuning systems.
A double sharp is indicated by the symbol and raises a note by two semitones (a whole tone). Double sharps were sometimes written , or .[1]
A half sharp or demisharp () raises a note by approximately a quarter tone. A sharp-and-a-half, three-quarter-tone sharp or sesquisharp () raises a note by three quarter tones.
A triple sharp (♯ or ♯) is extremely rare. It would raise a note by three semitones (a whole tone plus a semitone).[2][3] The B♯ below would be enharmonic with D natural.
While this system allows for higher multiples of sharps, triple sharps are the practical limit, and there are only a few examples in the literature. In other tuning systems, such as 53 equal temperament, quadruple sharps or beyond may be required. A quadruple sharp would be indicated by the symbol .[citation needed]
The standard order in which sharps occur in a key signature is "F♯ C♯ G♯ D♯ A♯ E♯ B♯", with a maximum of 7.
In a key signature, sharps or flats are placed to the right of the clef. The pitches indicated apply in every measure and octave.
Numberof sharps
Major key Sharp notes Minor key 0 C major – A minor 1 G major F♯ E minor 2 D major F♯, C♯ B minor 3 A major F♯, C♯, G♯ F♯ minor 4 E major F♯, C♯, G♯, D♯ C♯ minor 5 B major F♯, C♯, G♯, D♯, A♯ G♯ minor 6 F♯ major F♯, C♯, G♯, D♯, A♯, E♯ D♯ minor 7 C♯ major F♯, C♯, G♯, D♯, A♯, E♯, B♯ A♯ minorThe order of sharps in key signatures is F♯, C♯, G♯, D♯, A♯, E♯, B♯. Starting with no sharps or flats (C major), adding the first sharp (F♯) indicates G major, adding the next (C♯) indicates D major, and so on through the circle of fifths.
Some keys may be written as an enharmonically equivalent key. In the standard tuning system of 12-tone equal temperament, the key of C♯ major, with seven sharps, may be written as D♭ major, with five flats. In rare cases the sharp keys may be extended further, into key signatures requiring a double sharp (for example, G♯ major, which requires an F double-sharp).
When used as an accidental, the sharp sign applies to the note on which it is placed, and to subsequent similar notes in the same measure and octave. In modern notation accidentals do not apply to notes in other octaves, but this was not always the convention.
As with all accidentals, a sharp can be cancelled on a subsequent similar note in the same measure by using a flat (♭) or a natural(♮).
In Unicode, assigned sharp signs are as follows:
... the 25/ 24 ratio is the sharp (♯) ratio ... this raises a note approximately 70.6 cents.
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