Actually, the way these arrangements evolve is more organic and less analytical. It's on the order of "I know, man...you go "wumma wumma wumma wooooooo" and I'll come in on "wumma" with "beeroop, beeroop, beeroop", OK?? Let's try that!!"

You just do that a few hundred times and you've got My Girl! or What Becomes of a Broken Heart.

A