The term epic metal refers to metal bands that involve fantasy, history and mythology in their lyrics. Epic metal has no certain music characteristics and does not form a music genre. Epic metal bands used to record concept albums featuring an epic storyline behind it. Aliases for Epic metal include "fantasy metal", "battle metal", "barbarian metal", etc. Epic metal bands are usually power metal or heavy metal bands, but epic black metal, symphonic, progressive and folk metal bands are not uncommon.