Sharp (music)
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In music, sharp means that a given tone should be one semitone higher than usual. Thus, C-sharp is one semitone above C. On a piano keyboard, the sharp tones are the black keys.
In many cases, a sharp note will be the same tone as the flat note of the note above. For example, C-sharp is the same tone as D-flat. It is important to distinguish between them, however, since they will have different positions in the harmonic structure of the music.
In some rare cases, one will see a double sharp. This means that the tone must be raised by two semitones, or one full tone.
In musical notation, sharp is indicated by the symbol '♯', and double flat by 'x'.
