The primary distinction between free verse and blank verse is that free poetry does not follow a set meter pattern, rhyme scheme, or other musical rhythm, whereas blank verse follows regular metrical patterns.
Unrhymed but metric poetry with usually always iambic pentameter is referred to as "blank verse" in literature.
A line of poetry written in this manner is formed of five "iambs," groups of two syllables that fall into a "unstressed-stressed" pattern, most famously, like a heartbeat: buh-BUM, buh-BUM. This literary form is known as "iambic pentameter." Iambic pentameter lines are then traditionally mixed with end-rhymes to generate different rhyming patterns, as in a Shakespeare sonnet.
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