It is said that in Italy, on April 11th, 1770, Mozart and his father were attending the performance of the famous Miserere by Allegri, in the Sistine Chapel. The work had been jealously guarded by the master of the Chapel, who wanted to keep it exclusive (nobody had a score or copy of the work, and it was forbidden to even try to get one). After his first hearing, Wolfgang went back at the place where they were staying and wrote down the nine voices of the Miserere on score - which has since made the tour of the world. The entire work was already engraved in his memory after one hearing only!
The miracle of Mozart is in the way in which he composes. He first hears the music, in its entirety, in his mind, with the line of each instrument clearly outlined, and only after this he will write it on paper. Mozart composes frenetically, as fast as his pen slides on the paper, he never comes back on the scores and rarely makes corrections - a detail from the movie Amadeus shows Salieri's astonishment as he looks over Mozart's original scores, with no touch ups and a perfection of melody which inspires the thought that Mozart is the proof that God exists...
(from the site Wolfgang Amadeus Mozart)
Concerto for Flute and Harp in C (Andantino)
Serenade no 10 for Wind Instruments (Adagio)
Romance from Piano Concerto no 20
Romance from Piano Concerto no 21
Adagio from Piano Concerto no 23
Piano Concerto no 15 (3 - Allegro)
Piano Concerto no 22 (3 - Allegro)
Please see Mozart's Children on wordpress for more music.