Why Some Poems Refuse to Rhyme
Rhyme is not what makes a poem. Knowing what it actually does explains why so many poets put it down.
Ask most people to define a poem and rhyme will appear in the first sentence. Ask most working poets and it will not appear at all.
This is not snobbery, and it is not the twentieth century deciding that difficulty is a virtue. It is a practical disagreement about what rhyme does to a reader, and it is worth understanding whichever side you end up on.
What rhyme is actually for
Rhyme has two real functions and one accidental one.
The first is memory. Before poems were reliably written down they had to survive inside people, and rhyme is a superb error correcting mechanism. If you can remember one line you can usually recover the next, because the sound narrows the possibilities. Every oral tradition on earth worked this out independently.
The second is closure. A rhyme lands like a door catching. It tells the ear that a unit has completed, which is why rhymed couplets are so good at delivering judgements, jokes, and endings. Shakespeare closes scenes with them for exactly this reason.
The accidental function is the one that causes trouble: rhyme signals that a thing is a poem. It is a costume. And once a costume is doing the work of announcing the form, it starts competing with the content for the reader's attention.
The problem of the arriving rhyme
Here is the mechanism that makes poets nervous.
When a reader hears a strong rhyme, part of their mind starts working ahead. They are, quietly, predicting. If the poem is about anything ordinary, the set of available rhymes is small enough that the prediction often succeeds, and a successful prediction produces a specific small pleasure that has nothing whatsoever to do with what the poem is saying.
Rhyme lets the reader guess the next sound. Sometimes that pleasure is the enemy of what the poem is trying to do.
For light verse this is perfect. The pleasure of the mechanism is the point. For a poem about a hospital corridor, the kind of room where a book sometimes arrives uninvited, it is a catastrophe, because you have invited the reader to enjoy your machinery at precisely the moment you needed them looking at the corridor.
There is a second cost. Rhyme is a constraint, and constraints steer. Anyone who has written in strict form knows the moment where the honest word does not rhyme and the rhyming word is nearly honest, and the temptation to accept nearly is enormous. In a poem about faith or loss, nearly honest is worthless. So the poet drops the rhyme, not because form is oppressive but because on this particular subject accuracy has to outrank music.
What replaces it
Nothing, if the poem is bad. Something harder, if the poem is good.
Abandoning rhyme does not mean abandoning sound. It means moving the sound underground, where the reader feels it without being able to predict it. Assonance, repeated consonants, a rhythm that tightens as the poem narrows. Above all, the line break, which is the one tool poetry has that prose does not, and which controls where the reader is allowed to breathe.
Free verse is often taught as the absence of rules, which is why so much of it is bad. The rules do not disappear. They stop being public. In a sonnet the reader can check your work. In free verse the only thing holding the poem together is whether every break is deliberate, and there is nowhere to hide.
So should a poem rhyme
If the sound is doing something the sense needs, yes, and do it well enough that nobody notices you working.
If you are rhyming because poems rhyme, no. That is the costume talking.
The test is simple and slightly brutal. Read the poem aloud and ask whether any word is there because of its ending rather than its meaning. If you find one, you have your answer, and the answer is not that rhyme is dead. It is that this particular line was not being honest with you, and the rhyme is how you found out.