Sharp (music)

From Conservapedia

In music, sharp means that a given tone should be one semitone higher than usual. Thus, C-sharp is one semitone above C. Sharp keys on a piano will be one key higer than the base note; C-sharp is the black key above C, while E-sharp is actually F.

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 sharp by 'x'.