Cí (pronounced ; ) is a type of lyric poetry in the tradition of Classical Chinese poetry. "Cí" use a set of poetic meters derived from a base set of certain patterns, in fixed-rhythm, fixed-tone, and variable line-length formal types, or model examples. The rhythmic and tonal pattern of the "ci" are based upon certain, definitive musical song tunes. They are also known as "Changduanju" (長短句 / 长短句, "lines of irregular lengths") and "Shiyu" (詩餘 / 诗馀, "the poetry is besides Shi").