When we have to work out the rhyme scheme of any given poems, what we need to do is establish a set pattern of rhyme in each stanza and assign a letter to each different rhyme. This therefore is used to yield a rhyme scheme that is expressed in the form of letters which indicate how a given rhyme occurs. Let us look at the first stanza of this poem as an example:
Laugh and be merry, remember, better the world with a song,
Better the world with a blow in the teeth of a wrong.
Laugh, for the time is brief, a thread the length of a span.
Laugh and be proud to belong to the old proud pageant of man.
We can see that this stanza contains two different rhymes. "Song" and "wrong" rhyme in lines 1 and 2, and then "span" and "man" rhyme in lines 3 and 4. If we assign the letter A to the first rhyme, and B to the second rhyme, we can express the rhyme scheme of this poem as AABB. Quickly scanning down the rest of the poem reveals that this rhyme scheme is regular throughout the poem.