How did Franz Liszt’s thematic transformation influence Richard Wagner’s leitmotifs?

Franz Liszt pioneered the method of "transformation of themes," a compositional technique in which one or two musical themes are modified and presented in different forms to serve as the structural foundation for an entire work.1

This approach significantly influenced Richard Wagner, who derived his system of leitmotifs from Liszt’s principle. While Wagner is particularly associated with the leitmotif—using it to provide psychological insight, reinforce dramatic action, and recall extramusical ideas—the technical foundation of thematic transformation was already well advanced in Liszt’s symphonic poems before Wagner fully integrated it into his operas. By utilizing Liszt’s method of continual modification, Wagner was able to create a closely knit musical structure that allowed his themes to evolve alongside the dramatic events of his music dramas.12