Do-bayti (Persian: دوبیتی) (literally "two-couplet"), also known as fahlaviyat, is an ancient form of Persian poetry.
It is used to describe a Persian quatrain (a stanza or poem of four lines), similar to Ruba'i but different in meter.
When sung to a traditional melody, the first two lines are sung continuously in one 22-syllable phrase, and the 3rd and 4th lines in another, a little lower in pitch.
A well-known writer of do-bayti poems is the 11th-century Baba Taher-e Oryan of Hamadan, who wrote in the Hamadani dialect (which, however, is very close to standard Persian).
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