Gustav Mahler was an Austro-Bohemian Romantic composer, and one of the leading conductors of his generation. As a composer he acted as a bridge between the 19th-century Austro-German tradition and the modernism of the early 20th century. While in his lifetime his status as a conductor was established beyond question, his own music gained wide popularity only after periods of relative neglect, which included a ban on its performance in much of Europe during the Nazi era. After 1945 his compositions were rediscovered by a new generation of listeners; Mahler then became one of the most frequently performed and recorded of all composers, a position he has sustained into the 21st century.

Romantic music is a stylistic movement in Western Classical music associated with the period of the 19th century commonly referred to as the Romantic era. It is closely related to the broader concept of Romanticism—the intellectual, artistic, and literary movement that became prominent in Western culture from about 1798 until 1837.