Is it true that As you find with most songs in poetry each couplet must rhyme?

That statement is not entirely true. While rhyming couplets are common in poetry, they are not a requirement for all songs or poems.

Here's why:

* Many poetic forms do not rely on rhyming couplets: Free verse, blank verse, and sonnets are just a few examples of poems that often don't use couplets.

* Modern songs frequently use non-rhyming schemes: Many contemporary songs, especially in genres like rap and spoken word, prioritize rhythm and flow over strict rhyming patterns.

* Traditional songs often have their own rhyme schemes: Ballads, folk songs, and other traditional forms often use unique rhyming patterns, which may not be couplets.

In short, while rhyming couplets are a popular and effective poetic device, they are not a universal rule. There are many ways to create beautiful and impactful poetry and songs without relying solely on rhyming couplets.