フェリックス・ワインガルトナー
Until 1937, Roots led the Symphony Orchestra of the Conservatory of Tallinn. In 1937, a scholarship enabled him to study with Felix Weingartner in Vienna and attend summer courses with Nikolai Malko in Salzburg. In 1939 he became chief conductor of the Estonian Radio Orchestra. In 1942 he studied with Clemens Krauss in Salzburg.