If we can learn one thing from all these songs, it's that controversy sells.

Despite riling up millions and triggering heated battles across the world, many of these songs were extremely successful in their own rights. While some are anti-police and anti-fascism and others entertain Nazi sympathies and feature drugs and violence, all of these songs managed to rile people up (some more than others) and cemented their place in history.

Some songs are outright expressions of violence; others are vengeful responses to violence, but all unveil some of the darker, more brutal sides of the human mind. Many are stunningly relevant to today's most searing controversies.