What kind of structure does Whitman use in his poems? Why does he use these instead of the traditional rhythm?

"Table of Contents Poems" and "Parallelism Sentences". Whitman uses "catalog poems" and "parallel sentences" in his poems. When reading and reciting Whitman's works, he will find that his poems are full of musicality. In terms of poetic structure, his poems are free to make sentences, breaking the traditional rules of poetry and creating a free poetic style.