Iambic pentameter
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Iambic pentameter is a meter in poetry, consisting of an unrhymed line with five iambs or feet (hence pentameter), felt by many to be the most powerful of all metrical forms in English poetry. William Shakespeare excelled in the use of iambic pentameter (as in his famous Sonnet XVIII, beginning "Shall I compare thee to a summer's day"). And consider this from Christopher Marlowe's "Dr Faustus":

Was this the face that launch'd a thousand ships

And burnt the topless towers of Ilium?

When read aloud, such verse naturally follows a beat. Many feel the success of iambic pentameters is related to its sounding like a human heartbeat at rest. In written form it looks like this:

da-dum da-dum da-dum da-dum da-dum

(weak STRONG / weak STRONG / weak STRONG / weak STRONG / weak STRONG)

So Marlowe's work would follow the pattern:

Was-this the-face that-launch'd a-thou sand-ships

And-burnt the-top less-tow ers-of Il-ium?

There is some debate over whether works such as Shakespeare's and Marlowe's were originally performed with this rhythm prominent, or whether it was disguised by the patterns of normal speech as is common today.

The original article can be found at: http://en.wikipedia.org/wiki/Iambic_pentameter.
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