JAMCAT said:
Enslaved
Better than anything that will be mentioned in here, with the exception of Bathory. At least up until and including "Frost".
There are too many really good viking/folk/black metal bands on the world
I - Warriors (this is heavy/black, but it sounds like viking)
http://www.youtube.com/watch?v=6RbL4RKWGQw
Irminsul - Midvinterblot
http://www.youtube.com/watch?v=Y-zTm6JHbPo
Forefather - Steadfest
http://www.youtube.com/watch?v=Uytm9-C-Nl8
However, I don't know too much Folk/Viking Metal :/, I'm listening more to Black Metal, like:
Immortal - The sun that no longer rises
http://www.youtube.com/watch?v=NHM74p_QcTM
Belenos - Spicelge
http://www.youtube.com/watch?v=xqsWJ56_GVk
Darkthrone - Skald Av Satan Sol
http://www.youtube.com/watch?v=0_F4KiYFVWQ
Satyricon - Dark Medieval Times
http://www.youtube.com/watch?v=X64BM3Xu5hA
Obtained Enslavement - Witchcraft
http://www.youtube.com/watch?v=LVDzQi-FSS4
Hymir - Let The World Be Cold
http://www.youtube.com/watch?v=Y7ouE2SU8s8
Carach Angren - Van Der Decken's Triumph (This is from a conceptual album, so it sounds more complete with the rest of the tracks)
http://www.youtube.com/watch?v=0hXKC8xXq-0
Klabautamann - When I long for Life
http://www.youtube.com/watch?v=oRt-l6IYVsA
Necromass - A Serpent is screaming in the Abysm
http://www.youtube.com/watch?v=6nsv10Bds08
Setherial - In the still of a northern fullmoon
http://www.youtube.com/watch?v=2talTNLDJMI
Thorngoth - Eternal Downfall
http://www.youtube.com/watch?v=Bh1F3kO9cns
It sounds the same, but once you get on the mood of the music, it is awesome.
And, if I play some other mods on medieval setting, I put some flamenco:
Niño Miguel - Brisas de Huelvas
http://www.youtube.com/watch?v=4dqXJpYUuzM
Greetings ;d