I like poetry.about.com's definition of the villanelle which includes the breakdown of the rhyme scheme:
The villanelle’s 19 lines form five triplets and a quatrain, using only two rhymes throughout the whole form. The entire first line is repeated as lines 6, 12 and 18 and the third line is repeated as lines 9, 15 and 19—so that the lines which frame the first triplet weave through the poem like refrains in a traditional song, and together form the end of the concluding stanza. With these repeating lines [often called the repetend] represented as A1 and A2 (because they rhyme together), the entire scheme is:
A1
b
A2
a
b
A1 (refrain)
a
b
A2 (refrain)
a
b
A1 (refrain)
a
b
A2 (refrain)
a
b
A1 (refrain)
A2 (refrain)
A good example of a villanelle that many people know is Dylan Thomas' haunting, "Do Not Go Gentle Into That Good Night" which I will quote here, since it is in the Public Domain. I'll superimpose the rhyme scheme to the right so you can see how Thomas put together his villanelle.
Do Not Go Gentle Into That Good Night
By Dylan Thomas 1914-1953
Do not go gentle into that good night, A1
Old age should burn and rave at close of day; b
Rage, rage against the dying of the light. A2
Though wise men at their end know dark is right, a
Because their words had forked no lightning they b
Do not go gentle into that good night. A1
Good men, the last wave by, crying how bright a
Their frail deeds might have danced in a green bay, b
Rage, rage against the dying of the light. A2
Wild men who caught and sang the sun in flight, a
And learn, too late, they grieved it on its way, b
Do not go gentle into that good night. A1
Grave men, near death, who see with blinding sight a
Blind eyes could blaze like meteors and be gay, b
Rage, rage against the dying of the light. A2
And you, my father, there on the sad height, a
Curse, bless, me now with your fierce tears, I pray. b
Do not go gentle into that good night. A1
Rage, rage against the dying of the light. A2
* * *
In the process of trying to write villanelles, I have learned two things about writing villlanelles:
1. Be sure you have something worth repeating for your repeating lines as both repeating lines will each be repeated several times.
2, Choose your rhymes carefully. Because there are only two rhymes used throughout each villanelle, you have to choose your rhyme scheme carefully and be sure you have enough rhyming words that will work together to get you through the entire villanelle.
* * *
When deciding to write my villanelle for March Madness, I decided to use my unusual given word, 'incontinent,' in one of the repeating lines, because I was using the second definition :
- in·con·ti·nent
inˈkäntənənt,-ˈkäntn-ənt/
adjective
adjective: incontinent
having no or insufficient voluntary control over urination or defecation.
lacking self-restraint; uncontrolled.
"the incontinent hysteria of the fans"
synonyms: unrestrained, lacking self-restraint, uncontrolled, unbridled, unchecked, unfettered
Secondly, I brainstormed for ideas which were 'incontinent' in themselves; i.e., unrestrained, uncontrolled, unbridled, unfettered, and the one idea that kept coming to me was springtime where buds and blooms are bursting, people are feeling exuberant after a long, cooped-up winter, and are getting out to enjoy the outdoors, syrup is flowing out of maple trees, animals are mating, etc., a veritable riot of unrestrained, out-of-control, unfettered incontinence.
* * *
I'd like to include one more bit of information about the villanelle as a member of a family of repeating forms, such as the triolet, the pantoum, and the roundel.
I love Tilt-a-Whirl editor, Kate Bernadette Benedict's "Cheat Sheet of Poetic Forms ." (I believe Tilt-a-Whirl is no longer being published), but it was good while it lasted and is still online for your reading enjoyment. There are good examples of many of the repeating forms.