Norwegian symphonic black
metal band. While middle-aged
people generalize their lyrics as dark and angsty, unlike The Beatles, they have the ability to cover more than one topic in a single album, including poetically challenging extremist conservative religious fanatics, the
definition of morality, telling a narrative of Satan's assistant, and several more if you understand Norwegian.
Occasionally their music videos or lyrics contain unjustifiably objectionable material, but I interpret that this is their message to their fans not to become mindless followers of their band.