I truly enjoy metal bands that have a theme. Amon Amarth and Nile fall into this category. Another is Arsames, a truly underground death metal band from Mashhad, Iran. As the band name suggests, the theme is Ancient Persia. Here is "Xerxes" from the album Immortal Identity:

#CoSoMusic

https://www.youtube.com/watch?v=Gd2QN7G36u4