Much of the central conceit of Philip Pullman's fantasy trilogy "His Dark Materials" is rooted in the world of Blake's "The Marriage of Heaven and Hell". Canadian music composer Kathleen Yearwood is one of many contemporary musicians that have set Blake's poems to music. After World War II, Blake's role in popular culture came to the fore in a variety of areas such as popular music, film, and the graphic novel, leading Edward Larrissy to assert that "Blake is the Romantic writer who has exerted the most powerful influence on the twentieth century."