Outside of Finland, Kamu was principal conductor of the Oslo Philharmonic from 1975 to 1979.
Among the guest musicians of this first season were the conductor Arthur Nikisch, the pianists Eugen d'Albert, Edwin Fischer, Wilhelm Kempff, Ignaz Friedman and Artur Schnabel, and the violinists Bronisław Huberman and Carl Flesch.
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In spite of this, the orchestra continued to attract notable musicians and conductors, such as Richard Burgin, who later became concertmaster for Serge Koussevitzky in Boston; Max Rostal; Ernst Glaser; Robert Soetens, for whom Sergei Prokofiev's 2nd Violin Concerto was written; and others who were driven out of Germany by the Nazi regime - Igor Stravinsky, Fritz Busch, Erich Kleiber, and Bruno Walter.
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In 1962 he, along with Herbert Blomstedt, succeeded Odd Grüner-Hegge as head conductor of Oslo Philharmonic, the nation's leading orchestra, becoming one of the most influential figures in his country's postwar musical history.