Perhaps all these questions would make more sense if we knew what the teacher was using for the definition of “controversial” music.
I mean, there’s a huge difference between something like the reaction to Le Sacre du Printemps, the anti-Semitism in Wagner’s operas (the characterization of Mime in the Ring, for instance), or songs about political issues like a lot of singer-songwriter folk and punk. And then there are the things that people don’t like—the racism, violence, and amorality in a lot of rap and hip-hop, the jingoistic patriotism in a lot of manufactured country.
So: define “controversial music,” and maybe we’ll be able to write your paper for you.