There's more than one artist under this name:
1. Thorns (formed as Stigma Diabolicum, but changed name to Thorns after two years) is a Norwegian black metal band, masterminded by Blackthorn (Snorre W. Ruch - also in Mayhem and Satyricon). They made two highly influential demos in the early 90's, Grymyrk and Trøndertun, but have only released one full-length album, since the band was founded, in 1989.
Emperor is an influential Norwegian black metal band that represents a synth laden, progressive yet brutally aggressive and chaotic part of the genre, something quite different from the minimalism of other originators of the Norwegian black metal sound (e.g. Darkthrone). The band was formed around the core members Samoth (Tomas Thormodsæter Haugen) and Ihsahn (Vegard Sverre Tveitan) of the death metal band Thou Shalt Suffer and bass player Mortiis (Håvard Ellefsen) in Notodden, Norway, 1992.
Carpathian Forest (previously known as "The Childmolesters", then "Enthrone") emerged with the demo tape "Bloodlust and Perversion" in 1992. In 1993 the band released a second demo: Journey Through the Cold Moors of Svarttjern. The following year, Forest signed to Avantgarde Music and recorded their first EP, Through Chasm, Caves and Titan Woods in 1995, followed by the debut album Black Shining Leather in 1998.
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Blizzard is an Italian Eurodance group of X-energy records. Rumors say it was built around the vocalist Lora Trish.
3 singles were released and all of them were amazing great italo-eurodance.
The first single to be released was the very succesful It's Only Love in 1995.
Then came Without You (with vocals of Sharon Linn) in 1996,
followed by Living In The Night in 1997.
All of theses hits entered the Top 20 in Spain and Italy.
Svarttjern was formed late 2003 by HaaN & HansFyrste in Oslo, Norway. The two brothers played alone for some time until 2004 when they decided to bring more blood to the band. Grimmdun, Fjellnord and Skabb became members, and over the next years two demos were recorded. Late 2007 Skabb was replaced by Terror, and Svarttjern entered the studio again to record a three track promo. Svarttjern signs with Schwarzdorn Production for their debut album, and entered Strand Studio in Oslo summer 2008.