From the programme of the opera I went to see tonight:

Britten was once asked to identify the difference between his new opera, The Turn of the Screw, and his opera of 1946, The Rape of Lucretia. ‘The title is different, and the story’, replied Britten. ‘Oh yes, of course, but the music, Mr Britten – what would you say was the difference between the music of The Rape of Lucretia and The Turn of the Screw?’ ‘The notes are the same, but they are in a different order.’