section_path: Elements/Rhyme, alliteration, assonance/Rhyming schemes
section_name: Rhyming schemes
paragraph_text: Rhyming schemes
  
  In many languages, including Arabic and modern European languages, poets use rhyme in set patterns as a structural element for specific poetic forms, such as ballads, sonnets and rhyming couplets. However, the use of structural rhyme is not universal even within the European tradition. Much modern poetry avoids traditional rhyme schemes. Classical Greek and Latin poetry did not use rhyme. Rhyme entered European poetry in the High Middle Ages, due to the influence of the Arabic language in Al Andalus. Arabic language poets used rhyme extensively not only with the development of literary Arabic in the sixth century, but also with the much older oral poetry, as in their long, rhyming qasidas. Some rhyming schemes have become associated with a specific language, culture or period, while other rhyming schemes have achieved use across languages, cultures or time periods. Some forms of poetry carry a consistent and well-defined rhyming scheme, such as the chant royal or the rubaiyat, while other poetic forms have variable rhyme schemes.
  
  Most rhyme schemes are described using letters that correspond to sets of rhymes, so if the first, second and fourth lines of a quatrain rhyme with each other and the third line do not rhyme, the quatrain is said to have an AA BA rhyme scheme. This rhyme scheme is the one used, for example, in the rubaiyat form. Similarly, an A BB A quatrain (what is known as " enclosed rhyme ") is used in such forms as the Petrarchan sonnet. Some types of more complicated rhyming schemes have developed names of their own, separate from the "a-bc" convention, such as the ottava rima and terza rima. The types and use of differing rhyming schemes are discussed further in the main article.