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That was not the end of his run of luck, however. He reached the peak of his career, at the same time with Kodály, Bartók and Stravinsky, with setting out to compose an Indian opera, his biggest endeavour.
He was toying with the idea of composing an Indian opera back in 1931 in Hungary; however, its manifestation came to life in America. ‘Onteora’s Bride’, the opera elaborating on an Indian story, was presented at his place of work, the theatre of Radio City Hall in 1934. Its reception is best described by the number of performances for the audience in New York, as the following two weeks it was played four or five times a day, altogether 58 times. Consequently, the significant Indian Association of America even gave the honorary rank of chieftain to him.
In 1936, d’Antalffy orchestrated the concerto in d minor by Vivaldi-Bach for the New York Philharmonic Orchestra, one of the biggest orchestras of the world. As a result, the orchestra directed by John Barbirolli chose the organ virtuoso to be an honorary member in 1938. The piece was shown in 1940, which meant his last success as a composer.