Theoretical key the signature this leads to a key whose key signature has an additional sharp. A piece in C that performs this modulation would lead to the theoretical key of G major, requiring eight sharps, meaning an F in place of the F already present. To write that passage with a new key signature would require recasting the new section using the enharmonically equivalent key signature of A major. An example of such recasting is Claude Debussy's "Suite bergamasque": in the third movement "Clair de lune" the key shifts for a few measures from D major to D minor (eight flats),
Au clair de la lune she is singing him into drowsiness. I am on the floor, as usual among the chair legs, and I crawl behind my mother's chair because I do not like the song she is singing and do not want her to see what it does to me. She sings: "Au clair de la lune; Mon ami, Pierrot; Prête-moi ta plume; Pour écrire un mot." Then the vowels darken ominously. My mother's voice deepens dramatically, as if she were singing in a theater. This was the part of the song I disliked most, not only because I knew that it was sad,