Final answer:
Richard Wagner's concept of leitmotif has influenced thematic development in film scores and musical theatre, guiding emotional responses and narrative understanding through recurring musical themes.
Step-by-step explanation:
One aspect of musical life that has been particularly shaped by Richard Wagner's concept of leitmotif is the approach to thematic development in film scores and musical theatre. Wagner's use of leitmotifs, which are recurring musical themes associated with particular characters, places, emotions, or ideas, has influenced how composers for film and stage create their music.
This method allows the music to be an integral part of the storytelling, subtly guiding the audience's emotional response and understanding of the narrative. Notably, the leitmotif technique can be heard in the way John Williams composes for movies like Star Wars, where specific themes represent characters and concepts, enhancing the drama and memorability of the film's music.