Uncommon
Rhyme scheme
Pattern of rhymes at the end of each line of a poem or song
Rhyme scheme
A rhyme scheme is the pattern of rhymes at the end of each line of a poem or song. It is usually referred to by using letters to indicate which lines rhyme; lines designated with the same letter all rhyme with each other. An example of the ABAB rhyming scheme, from "To Anthea, who may Command him Anything", by Robert Herrick:
Open boosters, collect cards and trade them. Free to play.
Play for free