Second Viennese School accidental duration rule

The accidental duration rule of the Second Viennese School states that an accidental applies only to the note on which it is written. All notes show an accidental regardless of key signature, including unaltered notes which show naturals.

This accidental duration rule was used by Schoenberg and other composers of the Second Viennese School.

You can change the accidental duration rule on the Accidentals page in Notation Options.