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His father encouraged the awareness of classical music during Sunday sessions listening to radio broadcast concerts featuring the New York Philharmonic Orchestra as well as recordings by Vladimir Horowitz and Walter Gieseking.
In 1908 Karl Muck, then the conductor of the Boston Symphony Orchestra, recommended Fiedler as his successor as conductor of the orchestra, and he was duly appointed, having already appeared in the United States during 1905, when he had conducted the New York Philharmonic Orchestra alongside Willem Mengelberg and a year before the guest appearance of a German conductor noted for his Brahms, Fritz Steinbach.
An advocate of contemporary music, he conducted the premieres of Peter Mennin's Symphony No. 3 with the New York Philharmonic Orchestra in 1947, Bohuslav Martinů's Piano Concerto No. 3 with Rudolf Firkušný and the Dallas Symphony in 1949, Villa-Lobos's Cello Concerto No. 2 with Aldo Parisot and the New York Philharmonic Orchestra in 1954, and the American premiere of Kabalevsky's Requiem with students of the Eastman School in 1965.