In "Poem," Rukeyser writes in a form of poetry called lyrical form.
Lyric poetry refers to a formal sort of poetry expressing personal emotions or feelings, typically spoken in the first person. The term stems from a form of Ancient Greek literature, the lyric, which was defined by its musical accompaniment, often on a stringed instrument called lyre The term owes its importance in literary theory to the division developed by Aristotle between three broad categories of poetry: lyrical, dramatic, and epic.