What are accidentals in music? An are musical symbols used to modify the pitch of musical notes in written piece of music notation. There are different types of accidentals in music but the following are the three the three most commonly used accidentals in music. 1. Sharp sign. 2. Flat sign. 3. Natural sign. These three music accidental can turn a pitch sharp, flat, or back to its natural state. - Sharp Sign : It is used to raise the value of a musical note or pitch by a semitone. - Flat Sign : The flat sign is used to reduce the value of a pitch or musical not by a semitone. - Natural Sign : A natural sign is used to restore or bring back the value of a modified musical note back to its original position.