The literary adjective Yeatsian describes a piece of writing that's similar in style or theme to the poems of William Butler Yeats.
A Yeatsian poem might have a romantic theme, and it would definitely use musical rhythms and phrasing. Much Yeatsian writing is infused with spirituality and yearning, and includes imagery or references to Irish mythology. William Butler Yeats was a Romantic Irish poet who was equally influenced by Irish politics and a kind of religious mysticism — hints of these subjects in a piece of writing can also be called Yeatsian.