How did the use of leitmotifs in Tristan und Isolde express the characters’ emotions?

In Tristan und Isolde, Richard Wagner utilized leitmotifs to move beyond simple narrative labeling, employing them instead to convey profound psychological complexity and the characters' internal states.12

While Wagner often used leitmotifs in other works to identify specific characters, events, or objects, his approach in Tristan evolved toward a more fluid, associative style. By integrating these musical themes into a continuous, highly chromatic harmonic web, the orchestra—rather than just the singers—became the primary vehicle for expressing the lovers' unconsummated desire.23

The music in Tristan is characterized by harmonies that hover continuously on the verge of resolution, mirroring the characters' perpetual state of longing. Through this technique, the leitmotifs function through free association, allowing the music to articulate the deep, often unspoken emotional and metaphysical tensions of the drama. For instance, the opera features purely allusive elements, such as a three-note death theme, which serve to reinforce the dramatic action and provide psychological insight into the protagonists' tragic experience.321