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My personal admiration for Mozart's music -- especially his sacred music -- knows no boundaries. I am glad that his talent has also touched the heart and soul of so many Catholics -- today as well as in his lifetime. From the Vatican Secret Archives:
On the 10th April 1770, [Mozart] arrived in Rome together with his father and, as guest of many noble and ecclesiastic salons, the “infant prodigy” showed his mastery. He also went to a liturgical celebration in the Sistine Chapel, where he could listen to the Miserere by Gregorio Allegri (1582-1652) for two nine-part choirs; already knowing that he could not get the music score because it was strictly prohibited, he transcribed the piece by heart at the end of the liturgy, almost without any mistakes. Mozart so highly impressed the scholars of the Curia that Pope Clement XIV decided to honour the artistic talent of the this boy from Saltsburg by granting him a private audience (together with father Giovanni Battista Martini, another famous musician who Mozart had already met in Bologna), thus conferring him the high honour of the golden army or the “Golden Spur”. ... In the brief it is also possible to read a praise of the young musician (f. 24r: te, quem in suavissimo cymbali sonitu a prima adolescentia tua excellentem esse intelleximus).