I'm interested in music that is about philosophy, specifically about great philosophers. I prefer metal, though rock and other alt forms are acceptable. And obviously no black or death metal, I don't want to have to hunt down the lyrics, I want to listen and gather information.
I know there are a lot of metal bands that sing about philosophical concepts, but I want something more concrete. For example, something like Sabaton of philosophy. Fun Fact: while in high-school I did a test about WWII solely on Sabaton lyrics, and got an A. :D
Bands that focus on one school of thought are ok, but I would prefer bands that go over more of them, ideally over most of the important ones.
So, bands that sing about philosophy and history of philosophy, preferable metal?