If so, you’ve already heard a quatrain poem. A quatrain is a stanza with four lines and a rhyme scheme. While a quatrain is only one verse, a quatrain poem can contain any number of quatrains (including one).As a bonus, the rhyme schemes can be extremely varied, making these poems particularly adaptable and accessible.f so, you’ve already heard a quatrain poem. A quatrain is a stanza with four lines and a rhyme scheme. While a quatrain is only one verse, a quatrain poem can contain any number of quatrains (including one).