Accidentals are the symbols used in Western musical notation to modify the pitch, duration, or performance of a note. The most common accidentals are sharps, flats, and naturals. These symbols are necessary to indicate changes in the pitch of notes and to prevent confusion in notation. For example, a sharp symbol added to a note means it is to be played a half-step higher. Other synonyms for accidentals include accidental markings, chromatic alterations, and incidental alterations. Accidentals are essential to create a rich, complex musical texture and enhance the expressiveness and richness of the music. Understanding accidentals is crucial for any aspiring musician or composer in Western music.