Rhythm

definition: the effect produced in a play, film, novel, etc., by the combination or arrangement of formal elements, as length of scenes, speech and description, timing, or recurrent themes, to create movement, tension, and emotional value in the development of the plot.

example:The wind in her hair over there
The chair that sat with her hair
Eyes on eyes
Fire and lye
in the river sky on I

sentence: it is important because poems are all about beat and having a flowing, spiritual story told through your heart and rhythm and rhymes help keep a beat and help make poems flow more easily which makes the listener more attentive to your poems.