The last words of the first, second, and fifth lines rhyme with other. the last words of the third and fourth lines thyme with each other. Lymrics have stressed syloble so that they are read in a way that sounds like a song. It should have rhythm and rhyme so it sounds musical.

Bear in there:

There's a Polar Bear
In our Frigidaire--
He likes it 'cause it's cold in there.
With his seat in the meat
And his face in the fish
And his big hairy paws
In the buttery dish,
He's nibbling the noodles,
He's munching the rice,
He's slurping the soda,
He's licking the ice.
And he lets out a roar
If you open the door.
And it gives me a scare
To know he's in there--
That Polary Bear
In our Fridgitydaire.