Answer:
<h2>Ballad</h2><h2>I'm positive that Ballad is the correct answer.</h2>
It gives you visual proof that someone agreed to something, so that, later on, they can't say they didn't agree to that. It's like when you sign a contract, it is proof of the agreement.
It is home of the blues. Developed among the freed African Americans
The sugarhill gang in 1979