Heres some links to the bands and vids i usually watch or listen to
http://www.youtube.com/watch?v=oBpoNhf6Exc
http://www.youtube.com/watch?v=eABVwEgzIss
http://www.youtube.com/watch?v=JFq2YJKYa-k
Theres three Amon Amarth vids my fav
Dark Funeral vids
http://www.youtube.com/watch?v=oVB45E6N6LE
http://www.youtube.com/watch?v=llNu_MxquA0
http://www.youtube.com/watch?v=yVlcVpDaSJc
Rottting Christ vids
http://www.youtube.com/watch?v=a9s2Fx4OqN0
http://www.youtube.com/watch?v=MkIwVXu2Vfk
http://www.youtube.com/watch?v=BzRu4g6B6Jo