In order to write an essay like this, you need to do two things.
First, you need to list ways that the music industry has sought to protect copyrights. You could mention things like suing people who do file sharing, trying to shut down sites like Napster of the Pirate Bay that facilitated file sharing, and the use of digital copyright protection that makes it harder to do things like ripping music off of CDs.
Second, you would need to talk about whether these efforts make sense. You could look at what the industry's goal is. Presumably, they want to make more money. You can take that goal and then analyze each of the techniques mentioned above. You can ask if each technique is likely to make more or less money for the music industry in the short term and in the long term.