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Toured with Therion:
- 2001
Has also performed with:
- Aphasia
- Lion's Share
- Section A
- Sorcerer
- Twilight
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- Serpent
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Toured with Therion:
- 1998
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Swedish music producer, vocalist, guitarist, bassist, drummer and keyboardist.
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Has also performed with:
- Bloodbath
- Edge of Sanity
- Nightingale
- November's Doom
- Katatonia
- Opeth
- Unicorn
- Infestdead
- Route Nine
- Moontower
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- Grave
- Excruciate
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Member of the Indigo Orchestra
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Also contributed to the production of the albums
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Member of the Indigo Orchestra
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Has also performed with:
- Kazda
- 3[drei]
- Coração
- Das Pferd
- The Kovenant
- Rotten Christ
He is also a producer
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Toured with Therion:
- 2001, 2004-2006
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Toured with Therion:
- 1997
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began playing bass guitar at age eleven. While studying in high school, he took jazz theory and improvisation lessons from guitarist Johan Öijen. He attended the Stockholm music conservatory for sound engineering and music production studies.
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Has also performed with:
- Demonoid
- Mind's Eye
- Evil Masquerade
- Afterglow
- Chris Catena
- Hubi Meisel
- Frasse Haraldsen
- Lithium
- Moonstone
- Novak
- Tears of Anger
- The Murder Of My Sweet
Toured with Therion:
- 2001, 2004-2006
Has also performed with:
- Lithium
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Has also performed with:
- Unanimated
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Toured with Therion:
- 2004-2006
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Toured with Therion:
- 2007
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Toured with Therion:
- 1998
Has also performed with:
- Internal Decay
American singer, founder of the band Sinergy
Toured with Therion:
- 1997
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He studied jazz at Musicians Institute. In 1996 his song Industrial Type Thang was featured in JSR Records' compilation Hottest Unknown Guitarists. His style of playing mostly centers around legato and sweep picking. He is also brother of Johan Niemann.
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- Lithium
- Demonoid
- Purity Of Essence
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Has also performed with:
- Entombed
- Serpent
- Carbonized
- Mental Distortion
- Monastery
- Furcas
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Has also performed with:
- Imperium
- Theatre Of Tragedy
American singer from Minneapolis, Minnesota.
Toured with Therion:
- 2007
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Has also performed with:
- Grain
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Toured with Therion:
- 2001
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Austrian soprano
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Toured with Therion:
- The Vovin Tour
Has also performed with:
- Dreams of Sanity
- Korova
- Alas
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Toured with Therion:
- 2004-2007
Has also performed with:
- Krux
- Yngwie Malmsteen
- Abstrakt Algebra
- Southpaw
- At Vance
- Treat
- Swedish Erotica
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Has also performed with:
- Dismember
- Carnage
- Carbonized
- Entombed
- General Surgery
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Member of the Indigo Orchestra
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Co-founde of Therion.
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Co-founder of Therion.
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He founded the band Hypocrisy. He owns The Abyss recording studios.
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Former co-editor of Heathendoom Magazine
Toured with Therion:
- 2001
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Member of the Indigo Orchestra
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Drummer, composer, multi instrumentalist, singer, producer, sound engineer
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Toured with Therion:
- 2005-2009
Has also performed with:
- Holcoaster
- Argento
- Master Massive
- Kajarr
- Conspiracy
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Polish vocalist and drummer.
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- Symphony Masses - Ho Drakon Ho Megas
- Beauty in Black
- Theli
- A'arab Zaraq - Lucid Dreaming
- Secret of the Runes
- Lemuria and Sirius B
- Atlantis Lucid Dreaming
Has also performed with:
- Serpent
- Carbonized
- The Robots
Vocalist of Primal Fear
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Has also performed with:
- Primal Fear
- Gamma Ray
- Tyran' Pace
- Ayreon
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- Chimaira
- Ebony Tears
- Sorcerer
- Dog Faced Dogs
- Soilwork
- Demonoid
- Southpaw
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Toured with Therion:
- 2000-2006
Has also performed with:
- Luciferase
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Has also performed with:
- Lithium

Toured with Therion:
- 1997
English singer. Her vocal range is four octaves.
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Toured with Therion:
- 1997 to 2002
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Toured with Therion:
- 2007
Has also performed with:
- King Diamond
- Dream Evil
- Mercyful Fate
- Illwill
- Notre Dame
- Memento Mori
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Toured with Therion:
- 2001, 2004-2006
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Swedish vocalist, best known for working with hard rock and heavy metal bands including doom metal legends Candlemass and power metallers Stormwind. He is the son of famous opera singer Sven-Erik Vikström.
Toured with Therion:
- 2007
Has also performed with:
- Candlemass
- Stormwind
- Talisman

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Has also performed with:
- Necrophobic
- Sin
Tommy has published one book dealing with Draconian/Typhonian, Left Hand Path tradition of occultism and magic. It is called 'Mörk Magi'. He is one of the leading members of Swedish magical order Dragon Rouge
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He is both a musician and a record producer. He produced albums for bands like Therion, Tiamat, Samael, Moonspell and Lacuna Coil
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Has also performed with:
- Grip Inc.
- Voodoocult
- Despair
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