Accidentals, not accidents, is what I’m talking about. Everybody has experienced accidents, but in music, an accidental is a note of a pitch (or pitch class) that is not a member of the scale or mode indicated by the most recently applied key signature. In musical notation, the sharp (♯), flat (♭), and natural (♮) symbols, among others, mark such notes—and those symbols are also called accidentals. So, accidentals are a purposeful use in creating music. Accidents occur when you don’t plan on something, whether good or bad.