In 1877 Edvard Grieg informed his publisher that he had added a free, second piano to several of Mozart’s sonatas. As he later emphasised, his modernization did not change a single one of Mozart’s notes, but constituted a way of showing admiration for an old master. Grieg also intended the pieces for a duo of student at teacher; here the performers are a pianist of exceptional distinction and her legendary mentor: Elisabeth Leonskaja and Sviatoslav Richter.