Fixed verse

Fixed verse forms are a kind of template or formula that poetry can be composed in. The opposite of Fixed verse is Free verse poetry, which by design has little or no pre-established guidelines.

The various poetic forms, such as meter, rhyme scheme, and stanzas guide and limit a poet's choices when composing poetry. A fixed verse form combines one or more of these limitations into a larger form.

A form usually demands strict adherence to the established guidelines that to some poets may seem stifling, while other poets view the rigid structure as a challenge to be innovative and creative while staying within the guidelines.

Examples of Fixed Verse forms

Haiku

A Japanese form designed to be small and concise by limiting the number of lines and the number of syllables in a line. Japanese haiku are three-line poems with the first and the third line having five syllables and the middle having seven syllables. English-language Haiku may be shorter than seventeen syllables, though some poets prefer to keep to the 5-7-5 format.
Whitecaps on the bay:

A broken signboard banging

In the April wind.

—Richard Wright (collected in Haiku: This Other World, Arcade Publishing, 1998)

Sonnet

The sonnet is a European form and at its most basic requires that the total length be fourteen lines. There are two primary forms of the sonnet:
- English Sonnet
  
  In addition to above requirements, the English Sonnet must be four stanzas, the first three being quatrains and the last a couplet. Also the rhyme scheme for the quatrains is A-B-A-B and the final couplet is rhyming.
  Let me not to the marriage of true minds
  
  Admit impediments, love is not love
  
  Which alters when it alteration finds,
  
  Or bends with the remover to remove.
  
  O no, it is an ever fixed mark
  
  That looks on tempests and is never shaken;
  
  It is the star to every wand'ring bark,
  
  Whose worth's unknown although his height be taken.
  
  Love's not time's fool, though rosy lips and cheeks
  
  Within his bending sickle's compass come,
  
  Love alters not with his brief hours and weeks,
  
  But bears it out even to the edge of doom:
  
  If this be error and upon me proved,
  
  I never writ, nor no man ever loved.
  
  —William Shakespeare, Sonnet 116
  
  Italian Sonnet
  
  The Italian sonnet requires that the fourteen lines be broken into one octave (two quatrains), which describe a problem, followed by a sestet (two tercets), which gives the resolution to it.
  Methought I saw my late espoused Saint
  
  Brought to me like Alcestis from the grave,
  
  Whom Joves great Son to her glad Husband gave,
  
  Rescu'd from death by force though pale and faint.
  
  Mine as whom washt from spot of child-bed taint,
  
  Purification in the old Law did save,
  
  And such, as yet once more I trust to have
  
  Full sight of her in Heaven without restraint,
  
  Came vested all in white, pure as her mind:
  
  Her face was vail'd, yet to my fancied sight,
  
  Love, sweetness, goodness, in her person shin'd
  
  So clear, as in no face with more delight.
  
  But O as to embrace me she enclin'd
  
  I wak'd, she fled, and day brought back my night.
  
  —John Milton, Sonnet XXIII

Sestina

The sestina has a highly structured form consisting of six stanzas of six lines each, followed by a tercet (called its envoi or tornada) for a total of thirty-nine lines. The same set of six words ends the lines of each of the six-line stanzas, but in a different order each time.
Sestina

September rain falls on the house.

In the failing light, the old grandmother

sits in the kitchen with the child

beside the Little Marvel Stove,

reading the jokes from the almanac,

laughing and talking to hide her tears.

She thinks that her equinoctial tears

and the rain that beats on the roof of the house

were both foretold by the almanac,

but only known to a grandmother.

The iron kettle sings on the stove.

She cuts some bread and says to the child,

It's time for tea now; but the child

is watching the teakettle's small hard tears

dance like mad on the hot black stove,

the way the rain must dance on the house.

Tidying up, the old grandmother

hangs up the clever almanac

on its string. Birdlike, the almanac

hovers half open above the child,

hovers above the old grandmother

and her teacup full of dark brown tears.

She shivers and says she thinks the house

feels chilly, and puts more wood in the stove.

It was to be, says the Marvel Stove.

I know what I know, says the almanac.

With crayons the child draws a rigid house

and a winding pathway. Then the child

puts in a man with buttons like tears

and shows it proudly to the grandmother.

But secretly, while the grandmother

busies herself about the stove,

the little moons fall down like tears

from between the pages of the almanac

into the flower bed the child

has carefully placed in the front of the house.

Time to plant tears, says the almanac.

The grandmother sings to the marvelous stove

and the child draws another inscrutable house.

--Elizabeth Bishop

Villanelle

A villanelle has only two rhyme sounds. The first and third lines of the first stanza are rhyming refrains that alternate as the third line in each successive stanza and form a couplet at the close. A villanelle is nineteen lines long, consisting of five tercets and one concluding quatrain.
Do not go gentle into that good night,

Old age should burn and rave at close of day;

Rage, rage against the dying of the light.

Though wise men at their end know dark is right,

Because their words had forked no lightning they

Do not go gentle into that good night.

Good men, the last wave by, crying how bright

Their frail deeds might have danced in a green bay,

Rage, rage against the dying of the light.

Wild men who caught and sang the sun in flight,

And learn, too late, they grieved it on its way,

Do not go gentle into that good night.

Grave men, near death, who see with blinding sight

Blind eyes could blaze like meteors and be gay,

Rage, rage against the dying of the light.

And you, my father, there on the sad height,

Curse, bless, me now with your fierce tears, I pray.

Do not go gentle into that good night.

Rage, rage against the dying of the light.

—Dylan Thomas, Do not Go Gentle into That Good Night