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1885. Not much is known of his early music study, but he was sufficiently talented to be accepted at the Budapest Academy of Music where he studied composition with Hans (János) Koesller (1853-1926). Later, he continued his musical training in Leipzig, Germany, with Max Reger (1873-1916) and Karl Straube (1873-1950), and he studied organ in Bologna, Italy, with Enrico Bossi (1861-1925). Between 1906 and 1907, he was a coach and assistant conductor at the Opera of Cologne. At age 23, he began teaching organ and composition at the Budapest Academy of Music until 1921 and at the same time served as chief organist and choirmaster of the Szent István Basilica (St. Stephen's Cathedral). In 1921, he traveled to the United States for a concert tour. He also worked as organist at the Capitol Theatre, New York City, before he was invited by George Eastman to teach organ, specifically „motion picture accompaniment" at the Eastman Music School in Rochester. S. L. „Roxy" Rothafel hired d'Antalffy in 1927 as one of three organists for the opening of the Roxy Theatre in New York. In 1932, d'Antalffy became staff composer and organist for the Radio City Music Hall. He wrote „Dedication" to a poem by Martha Wilchinski for dedication of the Music Hall on December 27, 1932. He also wrote an oratorio, „The Voice of Millions", for the broadcast dedication of Rockefeller Center in 1932. Other compositions, such as his operetta, „Onteora's Bride", were performed int he Music Hall. He also played in Carnegie Hall as the organist of the New York Philharmonic Orchestra.