Published in 1784, Mozart’s Sonata in A major “for clavier solo”, with its famous “Alla Turca” finale, is one of the most popular works in the entire piano literature. After a section of the lost autograph was rediscovered a few years ago, another important source has surfaced with the appearance of a previously unknown contemporary copy of the complete autograph, which has prompted Bärenreiter to issue an up-to-date Urtext edition of this celebrated piece.

The copy by a professional Viennese...