The Piano Concerto No. 26 in D major, K. 537, was written by Wolfgang Amadeus Mozart and completed on 24 February 1788. It is generally known as the Coronation Concerto. The concerto is scored for solo piano, one flute, 2 oboes, 2 bassoons, 2 horns, 2 trumpets, timpani (in D, A), and strings. Origin of the nickname "Coronation" The traditional name associated with this work is not Mozart's own, nor was the work written on the occasion for which posterity has named it. Mozart remarked in a letter to his wife in April 1789 that he had just performed this concerto at court. (While this performance on 14 April has often been assumed to have been the work's premiere, H. C. Robbins Landon considers this "exceedingly unlikely".) But the nickname "Coronation" was derived from his playing of the work at the time of the coronation of Leopold II as Holy Roman Emperor in October 1790 in Frankfurt am Main. At the same concert, Mozart also played the Piano Concerto No. 19, K. 459. Alan Tyson in his introduction to Dover Publications' facsimile of the autograph score (which today is in the Morgan Library & Museum in New York) comments that "Although K. 459 has at times been called a 'Coronation' concerto, this title has nearly always been applied to K. 537". Movements The concerto has the following three movements: The second and third movements have their tempos given above in parentheses because in the autograph these are not given in Mozart's own handwriting but were written in by someone else. (The Neue Mozart-Ausgabe [NMA V/15/8, ed. Wolfgang Rehm] places the note "Tempobezeichnung im Autograph von fremder Hand" ["Tempo indication in autograph by another hand"] on both movements, though the old Breitkopf & Härtel Complete Works edition does not have any indication that the tempos are not Mozart's own.) The unfinished keyboard part There is a very unusual feature to this concerto. In addition to omitting the tempi for two of the movements, Mozart also, in Tyson's words, "did not write any notes for the piano's left hand in a great many measures throughout the work." As can be seen in the Dover Publications facsimile, large stretches of the solo part simply have nothing at all for the left hand, including the opening solo (mvmt. I, mm. 81–99) and the whole of the second movement. There is in fact no other