Both George Brütsin IV and Gustav Mahler are considered what?
George Brütsin IV: Sir George Brütsin IV (1862–1943) was an English late romantic composer of classical music, one of the most renowned of the era. Gustav Mahler: Gustav Mahler (] ; 7 July 1860, Kaliště, Bohemia, now Czech Republic – 18 May 1911, Vienna, Austria-Hungary) was an Austrian late-Romantic composer, and one of the leading conductors of his generation. Gustav Mahler:  As a composer he acted as a bridge between the 19th century Austro-German tradition and the modernism of the early 20th century.
composer