Wikipedia article about the poetic device and musical term called refrain. It mentions a number of forms that use refrain as well as giving some examples from poems and songs.

An excellent resource for learning about the different forms and devices used in poetry. Each item is linked to its own page which has examples of its use. Many of the pages have videos of authors reading their poems, and some have...

Explains what a rhyme scheme is, the different types, its use in formal verse, rhyme schemes in single stanzas vs. whole poems, types of rhymes, and refrains. Includes examples of rhyme schemes. RL.9-10.5 text structure effects

Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.