The origins of Vintersorg the band come from a band called Vargartron in 1994. The band eventually folded, but Vintersorg (the man) decided to continue with some of the band ideas, and so Vintersorg the band was born. Mostly a one-man project with only a couple of guests helping out (though guitarist Mattias Marklund is now considered an official full member), the Vintersorg style is epic, post-black metal, with occasional folk influences. Vintersorg's midrange vocals are unique (the closest comparison might be Dan Swano's clean/non-death style), he is a fine vocalist and a very good songwriter, as the songs have none of the self-indulgence one might expect from a one-man band.
Vintersorg (the man) has recently joined Borknagar as their vocalist, but this band remains an ongoing project. He is also a member of two other bands, the more folky Otyg and the gothic-inspired Havayoth, both of which have recorded albums.
Vintersorg, a Swedish black metal titan with 5 full-length albums under his belt, can only be described as avant-garde, for the way that he blends epic, ethereal Scandinavian black metal and folk metal.