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In music , sharp , diese -LRB- from French -RRB- , or diesis -LRB- from Greek -RRB- means higher in pitch .. music. music. French. French language. Greek. Greek language. pitch. pitch ( music ). More specifically , in musical notation , sharp means `` higher in pitch by a semitone -LRB- half step -RRB- '' , and has an associated sharp symbol , , which may be found in key signatures or as an accidental .. musical notation. musical notation. pitch. pitch ( music ). semitone. semitone. accidental. accidental ( music ). Sharp is contrasted with flat , which refers to a lowering of pitch .. pitch. pitch ( music ). flat. flat ( music ). Intonation may be flat , sharp , or both , successively or simultaneously .. flat. flat ( music ). Intonation. Intonation ( music ). simultaneously. Simultaneity ( music ). Under twelve-tone equal temperament , B , for instance , sounds the same as , or is enharmonically equivalent to , C natural -LRB- C -RRB- , and E is enharmonically equivalent to F .. equal temperament. equal temperament. natural. natural sign. In other tuning systems , such enharmonic equivalences in general do not exist .. enharmonic. enharmonic. tuning. Musical tuning#Tuning practice. To allow extended just intonation , composer Ben Johnston uses a sharp to indicate a note is raised 70.6 cents -LRB- ratio 25 :24 -RRB- , or a flat to indicate a note is lowered 70.6 cents .. flat. flat ( music ). just intonation. just intonation. Ben Johnston. Ben Johnston ( composer ). In tuning , sharp can also mean `` slightly higher in pitch '' -LRB- by some unspecified amount -RRB- .. pitch. pitch ( music ). tuning. Musical tuning#Tuning practice. If two simultaneous notes are slightly out of tune , the higher-pitched one -LRB- assuming the lower one is properly pitched -RRB- 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 '' .. small musical interval. Comma ( music )