rhythm

Definition: the beat/pattern of sound in a poem created when you read the poem out loud (also found in songs)

Example:
What are words
If you really don't mean them
When you say them
What are words
If they're only for good times
Then they don't
When it's love
Yeah, you say them out loud
Those words, They never go away
They live on, even when we're gone

What are words - Chris Medina

Significance: Rhythm make the poem sound more lively when reading out loud, and also make it intertesting for people to read.