Glawn or gaun (Thai กลอน) is a verse form used in the poetry and song of the Lao people; it is the most common text in traditional mor lam. It is made up of four-line stanzas, each with seven basic syllables (although sung glawn often includes extra, unstressed syllables). There is a set pattern for the tone marks to be used at various points in the stanza, plus rhyme schemes to hold the unit together. Performances of glawn are typically memorised rather than improvised. The Lao are an ethnic group of Southeast Asia. ... A khene player in Isan Mor lam (Thai/Isan: หมอลำ) is an ancient Lao form of song in Laos and Isan (Northeastern Thailand). ... In poetry, a stanza is a unit within a larger poem. ... A diacritic mark or accent mark is an additional mark added to a basic letter. ... A rhyme scheme is like the pattern of rhyming like lines in a poem or in like lyrics for music. ...

Reference

• Miller, Terry (ed.) Garland Encyclopedia of World Music: Volume 4 p. 325.