Viking metal The genre was pioneered by the Swedish band Bathory, who took some of their inspiration and musical style from American heavy metal band Manowar.Viking Metal as more of a lyrical or conceptual genre than a musical one. The themes explored by bands "usually come from Nordic and Viking mythology and dragon.
Viking metal is "noisy, chaotic, and often augmented by sorrowful keyboard melodies with influences from death metal, black metal and some power metal: bathory, enslaved, equilibrium
Folk / Pagan metal
Folk metal bands are influenced by folklore from various cultures and origins. Originally started as a mixture of folk rock, power metal and black metal, the term has progressed to encompass many folk-themed metal bands, that use folk based lyrical themes and composition, including instrumentation. This includes the widespread use of folk instruments and, to a lesser extent, traditional singing styles: Finntroll, Ensiferum,skyclad Korpiklaani and Moonsorrow. "pagan metal" describes the ideological points in the music, but doesn't say anything about the music itself.
Celtic metal is a fusion of heavy metal music and Celtic music:
Aes Dana, cruachan, eluvetie, mago de oz, suidraka, tuatha de danann, elvenking
Mittelalter rock or Mittelalter metal (Medieval rock or Medieval metal): subway to sally
Oriental metal is a subgenre of folk metal that combines heavy progressive metal and doom metal music with elements of traditional Middle Eastern music: orphaned land, salem
Folk-power metal
There are some folk metal and viking metal bands that take more influence from power metal than the darker atmosphere of black metal and some bands go as far as to replace extreme metal screaming with melodic singing. Lyrics may cross into both power metal and folk metal, sometimes featuring themes of both nature and fantasy. The genre may cross into extreme power metal. Elvenking, Falconer, Ensiferum, Turisas