: "This is the original version of 1875 played by Lazar Berman. The version of 1879 is exactly the same apart some small changes in the writing of the piano part in the 1st movement. The last version of 1889 (in fact published in 1894 after Tchaikovsky's death) is considered now as being not authentic, as we do not know which changes were approved by the composer. Alexander Siloti seems to be the one who drastically altered the opening chords into the form in which we know them today (covering the whole compass of the keyboard from the bottom octave to the top, marked fortissimo, and with the second and third chords no longer arpeggiated each time, but played with all the notes struck simultaneously. These chords, as Tchaikovsky originally wrote them, were confined to the middle part of the keyboard, and the second and third were arpeggiated each time, moreover they were marked only forte). Also the middle of the second movement was marked "Allegro vivace assai" and not "Prestissimo"."