composed in so short a time. He set to work to make a number of alterations to the score in order to convert the new Haffner serenade into the Haffner symphony. These alterations included dropping the introductory march (K. 385a) and one of the two minuets (now lost). In addition, the repeat signs were removed from the end of the first movement's exposition. Mozart also gave the Haffner Symphony a fuller sound by adding two flutes and two clarinets to the woodwind section of the first and last movements. These added woodwind parts are not new melodic material, but simply a doubling of octaves within the woodwinds. The Haffner Symphony, as we know it today, received its first performance on 23 March 1783 at the Vienna Burgtheater. At the concert, Mozart opened matters with the first three movements of this symphony, the aria "Se il padre perdei" from Idomeneo (described in his letter to his father of March 29 that year as his Munich opera), piano concerto no. 13 K. 415, a scena K. 369 (a genre related to the concert aria), the concertante movements from his last Finalmusik K. 320, his piano concerto K. 175 (with a new finale), and another scena, "Parto, m'affretto" (from the opera Lucio Silla, which he had composed for Milan); at this point he improvised a fugue "because the Emperor was present" and then two sets of variations (K. 398 on an aria by Paisiello and K. 455 on an aria by Gluck). After this, Madame (Aloysia) Lange sang his new rondo (K. 416?) and then to finish the concert, the last movement of the Haffner Symphony was played. The performance of the Haffner Symphony at this concert proved very successful. Cuyler (1995) classifies the Haffner, Linz (No. 36) and Prague (No. 38) symphonies as "three symphonies that transcend all his former symphonic works." The autograph manuscript currently resides in the archives of the Morgan Library & Museum in New York City. Instrumentation The symphony is scored for two flutes, two oboes, two clarinets in A, two bassoons, two horns in D and G, two trumpets in D, timpani, and strings. Analysis by key and movements The key The Haffner Symphony is in the key of D major. Mozart's choice of key for the Haffner Symphony is interesting, according to Cuyler, because "the key of D major, which was so felicitous for the winds,