@Jaimemn: Was Mozart publicly excommunicated for allegedly being a Freemason? If not, I really wonder how well-known his alleged Masonry was in his time, or if he even knew that one cannot be a Freemason and Catholic. It's certainly true The Magic Flute contains many references to Freemasonry, though.

Mozart admired Gregorian Chant to such an extent that he "went so far as to say that he would rather be the author of the Preface and Pater Noster, according to the same style, than of anything he had ever written." (source).

The Old Catholic Encyclopedia article on him, however, doesn't mention his being a Mason.

Even if he can be found in Masonic Lodges' records, this priest can certainly still offer a commemoration Oratio for the salvation of his soul.

So beautiful hearing, e.g., the Kyrie in liturgical context! Fr. Bernward Deneke, FSSP, is a gifted musician, too.

There's going to be one in New York on November 6, 2013.