Answer:
The structure is apparant when you read it a couple times.
Whether the beat is stressed or not makes a difference.
Whether the beat is quick and light, or slow and loud, also makes a diffference. Kind of like a piano.
Then again, word choice also matters.
Let's take the beat. Its light and quick, it rhymes and there isn't a lot of long words.
It's happy! Or, It would be if there wasn't sad words in it. It wouldn't make sense.
If you match both of them up, ( quick, light, happy words) you'd make a great poem!
(I'm not really good at in-depth writing, sorry)