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In music, sharp, dièse (from French), or diesis (from Greek) means higher in pitch and the sharp symbol raises a note by a half tone.〔Benward & Saker (2003). ''Music in Theory and Practice, Vol 1'', p.6. McGraw-Hill, Seventh edition. "''Sharp'' ()—raises the pitch a half step."〕 Intonation may be flat, sharp, or both, successively or simultaneously. More specifically, in musical notation, sharp means "higher in pitch by a semitone (half step)," and has an associated symbol (), which may be found in key signatures or as an accidental, as may flats. Under twelve-tone equal temperament, ''B sharp'', for instance, sounds the same as, or is enharmonically equivalent to, ''C natural'', and ''E sharp'' is enharmonically equivalent to ''F natural''. In other tuning systems, such enharmonic equivalences in general do not exist. To allow extended just intonation, composer Ben Johnston uses a sharp to indicate a note is raised 70.6 cents (ratio 25:24), or a flat to indicate a note is lowered 70.6 cents.〔John Fonville. "Ben Johnston's Extended Just Intonation- A Guide for Interpreters", p.109, ''Perspectives of New Music'', Vol. 29, No. 2 (Summer, 1991), pp. 106-137. "...the 25/24 ratio is the sharp () ratio...this raises a note approximately 70.6 cents."〕 In tuning, sharp can also mean "slightly higher in pitch" (by some unspecified amount). If two simultaneous notes are slightly out of tune, the higher-pitched one (assuming the lower one is properly pitched) is said to be sharp with respect to the other. Furthermore, the verb ''sharpen'' means "raise the frequency of a note, typically by a small musical interval". Double sharps also exist; these are denoted by the symbol and raise a note by two semitones, or one whole tone. Less often (in for instance microtonal music notation) one will encounter half, or three-quarter, or otherwise modified, sharps. A half sharp indicates the use of quarter tones, and may be marked with various symbols including . Although very uncommon, a triple sharp () can sometimes be found. It raises a note by three semitones. ==Correctly drawing and printing the sharp sign== The sharp symbol () may be confused with the number (hash or pound) sign (#). Both signs have two sets of parallel double-lines. However, a correctly drawn sharp sign must have two slanted parallel lines which rise from left to right, to avoid being obscured by the staff lines. The number sign, in contrast, has two compulsory horizontal strokes in this place. In addition, while the sharp also always has two perfectly vertical lines, the number sign (#) may or may not contain perfectly vertical lines (according to typeface and writing style). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sharp (music)」の詳細全文を読む スポンサード リンク
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