As a composer, Mahler primarily wrote symphonies and song cycles, known for their monumental length, complex structures, and emotional depth. His best-known symphonies include the Resurrection Symphony (No. 2), the Symphony of a Thousand (No. 8), and his Symphony No. 9, regarded as his musical farewell. Mahler's works explore existential themes such as life, death, love, and redemption. His music is characterized by contrasting moods and incorporates folk and religious motifs, set within rich and often dramatic orchestral textures.
Mahler, who faced opposition due to his Jewish background and intense work style, struggled with personal conflicts and self-doubt throughout his life. His marriage to Alma Mahler was filled with passion and conflict, often finding indirect expression in his music. The death of his eldest daughter and his diagnosis of a heart condition left a profound impact on his work, which became increasingly melancholic and introspective.
Gustav Mahler died on May 18, 1911, in Vienna from heart disease, just as modernism was beginning to take hold in music. Although his compositions were not always understood or appreciated during his lifetime, Mahler is now regarded as one of the most significant symphonic composers of the 20th century. His works continue to shape the symphonic repertoire and have influenced countless composers and musicians in the modern era.