Lyric poetry is a formal type of poetry which expresses personal emotions or feelings, typically spoken in the first person. It is not equivalent to song lyrics, though they are often in the lyric mode. The term derives from a form of Ancient Greek literature, the lyric, which was defined by its musical accompaniment, usually on a stringed instrument known as a 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.