The great sonata in D major for two pianos K. 448 is, of course, the absolute flagship of this “Urtext” edition. The first movement sets off like an opera opening with drums and trumpets, the Andante is a superb and unique dialogue between the two pianos and the grand finale rondo sounds like a concerto for piano without orchestra. In this edition Henle is yet another important work, in this case, in its original form of 1783, the fugue grave in C minor for two pianos K. 426 on which still hangs the spirit of Händel or Bach. Mozart published it shortly after in a four-voice version for strings, adding a magnificent adagio introduction composed for the occasion. For the present edition, the latter has been transcribed in turn for two pianos by the formidable musician Franz Beyer, who has also produced an executable version for two pianos of "Larghetto and Allegro" in E flat major (absent from the Köchel catalog) of which we only have fragments. The execution of all the works in this volume requires the acquisition of two editions.