A parachute fell from the sky,
Below was a sixty pig sty,
Baked beans producing gas
Exploded from their ass
And proved that sixty pigs can fly.

To polish up the rhythm slightly :

A parachute fell from the sky.
Below was a sixty-pig sty.
Beans turned into gas
Rushing out of their ass
Showed us how to make sixty pigs fly.

Rhyme scheme? Check.
Rhythm? Check.
Humor? Maybe. Of a sort.
A question: What does the parachute have to do with anything? Could have equally been a parakeet, an elephant, The President, a barnicle, a bicycle, a Witherspoon, a Communist, or a Googolplex.

We've got the notes right and the rhythm right, but I'm not sure it's music yet.