 Mozart himself wrote to his sister in 1784 agreeing with her that something was missing in the slow movement of K. 451, and an embellished part of the passage in question is preserved in St. Peters Archabbey, Salzburg (see location of autographs below); presumably the part he sent her.Mozart also wrote embellished versions of several of his piano sonatas, including the Dürnitz Sonata, K. 284/205b; the slow movement of K. 332/300k; and the slow movement of K. 457.In all of these works, the embellishments appear in the first editions published under Mozart's guidance, with the suggestion that they represent examples of embellishments for lesser pianists than himself to follow.