Why is Richard Wagner considered an influential composer in Western music?

Richard Wagner is considered one of the most influential figures in Western music because he fundamentally transformed the structure, harmony, and dramatic scope of operatic composition. His influence stems from both his innovative techniques and the subsequent reactions of other composers to his work.12

Key aspects of his influence include:

• Gesamtkunstwerk: Wagner pioneered the concept of the Gesamtkunstwerk, or "total work of art," where he exerted control over all elements—music, libretto, staging, and design—to ensure they were unified in service of the drama.3
• Leitmotif Technique: He refined the use of leitmotifs—recurring musical themes that symbolize characters, situations, or ideas—to provide psychological depth and structural cohesion to his large-scale music dramas.143
• Harmonic Innovation: Wagner’s advanced use of chromaticism, particularly in Tristan und Isolde, pushed the boundaries of traditional functional harmony. By blurring tonality and delaying resolutions, he created a new expressive language that paved the way for the dissolution of the diatonic system and influenced the development of 20th-century music.53
• Orchestral Role: He elevated the orchestra from a mere accompaniment to a driving force of the drama, capable of expressing complex psychological nuances.13