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'''Jeroen Paul Thesseling''' (born 13 April 1971) is a Dutch musician, most famous for his work in the German [[technical death metal]] band [[Obscura (band)|Obscura]][{{cite web|last=Rivadavia |first=Eduardo |url=http://www.allmusic.com/artist/obscura-p971901/biography |title=Obscura |publisher=AllMusic |date= |accessdate=2011-12-15}}], the Dutch progressive death metal band [[Pestilence (band)|Pestilence]].[{{cite web|last=Serba |first=John |url=http://www.allmusic.com/artist/pestilence-p13934/biography |title=Pestilence |publisher=AllMusic |date=2002-07-22 |accessdate=2011-12-15}}] and the Dutch-American metal-fusion group Quadvium.{{cite web|author=Blabbermouth.net Staff |url=https://www.blabbermouth.net/news/testament-ex-obscura-bassists-team-up-in-quadvium/|title=Testament and former Obscura bassists team up in Quadvium |publisher=Blabbermouth.net |date=2019-11-02 |accessdate=2019-12-09}} |
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'''Jeroen Paul Thesseling''' (born 13 April 1971) is a Dutch musician, most famous for his work in the German [[technical death metal]] band [[Obscura (band)|Obscura]][{{cite web|last=Rivadavia |first=Eduardo |url=http://www.allmusic.com/artist/obscura-p971901/biography |title=Obscura |publisher=AllMusic |date= |accessdate=2011-12-15}}], the Dutch progressive death metal band [[Pestilence (band)|Pestilence]].[{{cite web|last=Serba |first=John |url=http://www.allmusic.com/artist/pestilence-p13934/biography |title=Pestilence |publisher=AllMusic |date=2002-07-22 |accessdate=2011-12-15}}] and the Dutch-American metal-fusion group Quadvium.[https://www.allmusic.com/artist/quadvium-mn0004833737] |
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Thesseling began studying bass in 1988 at the [[Artez|ArtEZ]] School of Music in [[Enschede]], [[Netherlands]]. Between 1992 and 1994, he was a member of [[Pestilence (band)|Pestilence]], with whom he recorded the jazz fusion-influenced album ''[[Spheres (Pestilence album)|Spheres]]''.[{{cite web|last=Beller |first=Bryan |url=http://www.bassplayer.com/artists/jeroen-paul-thesseling-of-obscura |title=Jeroen Paul Thesseling of Obscura |publisher=Bassplayer.com |date=2010-03-09 |accessdate=2018-06-10}}] In 1995 Jeroen started to study microtonality, which resulted in two pieces: ''Hafnium'' — study in 72-tone equal temperament (1999) — and ''Argon'' — study in 18-tone equal temperament (2000). The period following, Arabic microtonal and [[contemporary classical music]] inspired him to focus primarily on fretless bass.[{{cite web|last=Larson |first=Eric |url=http://www.fretlessbass.com/thesseling-jeroen/ |title=Fretless Questions: Jeroen Paul Thesseling |publisher=Fretlessbass.com |date=2007-02-28 |accessdate=2018-05-24}}] In 2005, he recorded his first fretless work with the studio group Ensemble Salazhar.[{{cite web|last=Thesseling |first=Jeroen Paul |url=http://www.jeroenpaulthesseling.com/ |title=Biography Jeroen Paul Thesseling |publisher=Jeroenpaulthesseling.com |date=2005-02-18 |accessdate=2021-08-08}}] Despite their highly acclaimed demo ''Colors'' the group never officially released recordings.[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/ensemble-salazhar-featuring-ex-pestilence-bassist-new-demo-recordings-posted-online/ |title=Ensemble Salazhar featuring ex-Pestilence bassist - New demo recordings posted online |publisher=Blabbermouth.net |date=2008-01-21 |accessdate=2018-06-10}}] Between 2007 and 2011, he collaborated with [[Obscura (band)|Obscura]] and recorded with them ''[[Cosmogenesis (album)|Cosmogenesis]]'' (2009)[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/obscura-cosmogenesis-first-week-u-s-sales-revealed/ |title=Obscura Cosmogenesis first week US sales revealed |publisher=Blabbermouth.net |date=2009-02-25 |accessdate=2018-05-30}}] and ''[[Omnivium]]'' (2011).[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/obscura-omnivium-first-week-sales-revealed/ |title=Obscura Omnivium first week US sales revealed |publisher=Blabbermouth.net |date=2011-04-06 |accessdate=2018-05-30}}] Between 2009 and 2012, he rejoined Pestilence after a 15-year break[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/pestilence-rejoined-by-bassist-jeroen-paul-thesseling/ |title=Pestilence rejoined by bassist Jeroen Paul Thesseling |publisher=Blabbermouth.net |date=2009-10-29 |accessdate=2018-05-30}}][{{cite web|last=Staff |first=Metalstorm.net |url=http://www.metalstorm.net/events/news_comments.php?news_id=9682 |title= Pestilence rejoined by Jeroen Paul Thesseling after 15-year hiatus |publisher=Metalstorm.net |date=2009-10-30 |accessdate=2009-10-30}}] and recorded their sixth studio album ''[[Doctrine (Pestilence album)|Doctrine]]'' (2011). Since 2011, he has played exclusively fretless 7-string basses built by German bass luthier [[Warwick (guitar manufacturer)|Warwick]]; they are strung with a subcontra F#-tuning (F#0–B0–E1–A1–D2–G2–C3).[{{cite web |last=Amador |first=Valery |url=https://bassmusicianmagazine.com/2011/07/warwick-releases-jeroen-paul-thesselings-7-string-fretless-bass/ |title=Warwick releases Jeroen Paul Thesseling's 7-string fretless bass |publisher=Bassmusicianmagazine.com |date=2011-07-01 |accessdate=2018-05-30 |archive-date=2018-06-12 |archive-url=https://web.archive.org/web/20180612143538/https://bassmusicianmagazine.com/2011/07/warwick-releases-jeroen-paul-thesselings-7-string-fretless-bass/ |url-status=dead }}][{{cite web|last=Johnson |first=Kevin |url=http://www.notreble.com/buzz/2011/11/17/ultra-low-an-interview-with-jeroen-paul-thesseling/ |title=Ultra Low: An Interview with Jeroen Paul Thesseling |publisher=Notreble.com |date=2011-11-17 |accessdate=2018-05-24}}][{{cite web|last=Beller |first=Bryan |url=http://www.bassplayer.com/artists/machines-of-death-four-extreme-metal-bassists-lay-out-their-weapons-of-choice |title=Machines of Death: Four Extreme Metal Bassists Lay Out Their Weapons of Choice |publisher=Bassplayer.com |date=2012-05-11 |accessdate=2018-05-26}}] In late 2014, he founded the jazz fusion group Salazh Trio[{{cite web|last=Kennelty |first=Greg |url=http://www.metalinjection.net/latest-news/ex-obscura-bassist-has-a-new-fusion-trio-named-salazh-trio |title=Ex-Obscura Bassist Has A New Fusion Trio Named Salazh Trio |publisher=Metalinjection.net |date=2015-05-21 |accessdate=2018-05-24}}] featuring legendary Cuban drummer/percussionist [[Horacio Hernández]]. Their debut work ''Circulations'' was released in December 2017.[{{cite web|last=Staff |first=Drummerszone.com |url=https://drummerszone.com/news/horacio-el-negro-hernndez-new-salazh-trio-album/artist-news-1-13598/article/ |title= Horacio 'El Negro' Hernández' new Salazh Trio-album |publisher=Drummerszone.com |date=2017-12-18|accessdate=2017-12-18}}][{{cite web|last=D'Auria |first=Jon |url=http://www.bassplayer.com/artists/jeroen-paul-thesseling-and-the-salazh-trio-reveal-debut-album |title=Jeroen Paul Thesseling and the Salazh Trio Reveal Debut Album |publisher=Bassplayer.com |date=2018-04-04 |accessdate=2018-05-24}}][{{cite web|last=Amador |first=Valery |url=https://www.bassmusicianmagazine.com/2017/12/bassist-jeroen-paul-thesselin-news-salazh-trio-debut-album-circulations/ |title= Bassist Jeroen Paul Thesseling - Salazh Trio releases debut album 'Circulations' |publisher=Bassmusicianmagazine.com |date=2017-12-26 |accessdate=2017-12-26}}] In October 2019, he founded the instrumental progressive metal-fusion quartet Quadvium with fellow fretless bass player [[Steve Di Giorgio]].[{{cite web|last=Staff |first=Bassmagazine.com |url=https://www.bassmagazine.com/artists/bassists-steve-di-giorgio-and-jeroen-paul-thesseling-create-new-group-quadvium |title= Bassists Steve Di Giorgio and Jeroen Paul Thesseling create new group Quadvium |publisher=Bassmagazine.com |date=2019-10-31 |accessdate=2019-10-31}}][{{cite web|last=Staff |first=Notreble.com |url=https://www.notreble.com/buzz/2019/11/03/steve-di-giorgio-and-jeroen-paul-thesseling-announce-new-band/|title= Steve Di Giorgio and Jeroen Paul Thesseling announce new band |publisher=Notreble.com |date=2019-11-03 |accessdate=2019-11-03}}] From 2020 till 2022 Jeroen rejoined the German technical death metal band [[Obscura (band)|Obscura]] after a nine-year break.[{{cite web|last=Staff |first=Bassmagazine.com |url=https://bassmagazine.com/artists/jeroen-paul-thesseling-the-7-string-fretless-master-returns |title= Jeroen Paul Thesseling: The 7-string fretless master returns |publisher=Bassmagazine.com |date=2022-03-22 |accessdate=2022-05-15}}][{{cite web|last=Staff |first=Bassmagazine.com |url=https://www.bassmagazine.com/artists/fretless-bassist-jeroen-paul-thesseling-rejoins-obscura |title= Fretless bassist Jeroen Paul Thesseling rejoins Obscura |publisher=Bassmagazine.com |date=2020-04-29 |accessdate=2020-04-29}}][{{cite web|author=Blabbermouth.net Staff |url=https://www.blabbermouth.net/news/bassist-jeroen-paul-thesseling-rejoins-obscura/|title=Bassist Jeroen Paul Thesseling rejoins Obscura |publisher=Blabbermouth.net |date=2020-04-30 |accessdate=2020-04-30}}][{{cite web|last=Staff |first=Notreble.com |url=https://www.notreble.com/buzz/2020/04/30/jeroen-paul-thesseling-rejoins-obscura/|title= Jeroen Paul Thesseling rejoins Obscura |publisher=Notreble.com |date=2020-04-30 |accessdate=2020-04-30}}] With them, he recorded their sixth studio album ''[[A Valediction]]'' (2021).[{{Cite web|last=Blabbermouth|date=2021-06-16|title=OBSCURA Announces 'A Valediction' Album|url=https://www.blabbermouth.net/news/obscura-announces-a-valediction-album/|access-date=2021-06-16|website=Blabbermouth.net}}][{{cite web|last=Staff |first=Notreble.com |url=https://www.notreble.com/buzz/2021/12/06/obscura-releases-a-valediction-with-jeroen-paul-thesseling/|title= Obscura Releases “A Valediction” With Jeroen Paul Thesseling |publisher=Notreble.com |date=2021-12-06 |accessdate=2022-01-03}}] In 2024 Quadvium finished their much anticipated recordings and released the debut studio album ''Tetradōm'' (2025) via Agonia Records. [{{Cite web|last=NoTreble|date=2025-04-05|title=A Bass Dream Realized: Steve Di Giorgio & Jeroen Paul Thesseling’s Vision Comes to Life on “Tetradom” |url=https://www.notreble.com/buzz/2025/04/05/a-bass-dream-realized-steve-di-giorgio-jeroen-paul-thesselings-vision-comes-to-life-on-tetradom/ |access-date=2025-04-25|website=Notreble.com}}][{{Cite web|last=Blabbermouth|date=2025-04-24|title=Steve Di Giorgio and Jeroen Paul Thesseling Bring The Dual Fretless Bass Player Concept To Life In QUADVIUM |url=https://blabbermouth.net/features/steve-digiorgio-and-jeroen-paul-thesseling-bring-the-dual-fretless-bass-player-concept-to-life-in-quadvium |access-date=2025-04-24|website=Blabbermouth.net}}] Jeroen lives in Amsterdam, the Netherlands. [{{cite web|last=Staff |first=Bassmagazine.com |url=https://bassmagazine.com/artists/bass-magazine-lockdown-check-in-with-jeroen-paul-thesseling |title= Bass Magazine Lockdown Check-In With Jeroen Paul Thesseling |publisher=Bassmagazine.com |date=2020-06-03 |accessdate=2020-08-09 |website=Bassmagazine.com}}] |
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Thesseling began studying bass in 1988 at the [[Artez|ArtEZ]] School of Music in [[Enschede]], [[Netherlands]]. Between 1992 and 1994, he was a member of [[Pestilence (band)|Pestilence]], with whom he recorded the jazz fusion-influenced album ''[[Spheres (Pestilence album)|Spheres]]''.[{{cite web|last=Beller |first=Bryan |url=http://www.bassplayer.com/artists/jeroen-paul-thesseling-of-obscura |title=Jeroen Paul Thesseling of Obscura |publisher=Bassplayer.com |date=2010-03-09 |accessdate=2018-06-10}}] In 1995 Jeroen started to study microtonality, which resulted in two pieces: ''Hafnium'' — study in 72-tone equal temperament (1999) — and ''Argon'' — study in 18-tone equal temperament (2000). The period following, Arabic microtonal and [[contemporary classical music]] inspired him to focus primarily on fretless bass.[{{cite web|last=Larson |first=Eric |url=http://www.fretlessbass.com/thesseling-jeroen/ |title=Fretless Questions: Jeroen Paul Thesseling |publisher=Fretlessbass.com |date=2007-02-28 |accessdate=2018-05-24}}] In 2005, he recorded his first fretless work with the studio group Ensemble Salazhar.[{{cite web|last=Thesseling |first=Jeroen Paul |url=http://www.jeroenpaulthesseling.com/ |title=Biography Jeroen Paul Thesseling |publisher=Jeroenpaulthesseling.com |date=2005-02-18 |accessdate=2021-08-08}}] Despite their highly acclaimed demo ''Colors'' the group never officially released recordings.[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/ensemble-salazhar-featuring-ex-pestilence-bassist-new-demo-recordings-posted-online/ |title=Ensemble Salazhar featuring ex-Pestilence bassist - New demo recordings posted online |publisher=Blabbermouth.net |date=2008-01-21 |accessdate=2018-06-10}}] Between 2007 and 2011, he collaborated with [[Obscura (band)|Obscura]] and recorded with them ''[[Cosmogenesis (album)|Cosmogenesis]]'' (2009)[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/obscura-cosmogenesis-first-week-u-s-sales-revealed/ |title=Obscura Cosmogenesis first week US sales revealed |publisher=Blabbermouth.net |date=2009-02-25 |accessdate=2018-05-30}}] and ''[[Omnivium]]'' (2011).[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/obscura-omnivium-first-week-sales-revealed/ |title=Obscura Omnivium first week US sales revealed |publisher=Blabbermouth.net |date=2011-04-06 |accessdate=2018-05-30}}] Between 2009 and 2012, he rejoined Pestilence after a 15-year break[{{cite web|author=Blabbermouth.net Staff |url=http://www.blabbermouth.net/news/pestilence-rejoined-by-bassist-jeroen-paul-thesseling/ |title=Pestilence rejoined by bassist Jeroen Paul Thesseling |publisher=Blabbermouth.net |date=2009-10-29 |accessdate=2018-05-30}}][{{cite web|last=Staff |first=Metalstorm.net |url=http://www.metalstorm.net/events/news_comments.php?news_id=9682 |title= Pestilence rejoined by Jeroen Paul Thesseling after 15-year hiatus |publisher=Metalstorm.net |date=2009-10-30 |accessdate=2009-10-30}}] and recorded their sixth studio album ''[[Doctrine (Pestilence album)|Doctrine]]'' (2011). Since 2011, he has played exclusively fretless 7-string basses built by German bass luthier [[Warwick (guitar manufacturer)|Warwick]]; they are strung with a subcontra F#-tuning (F#0–B0–E1–A1–D2–G2–C3).[{{cite web |last=Amador |first=Valery |url=https://bassmusicianmagazine.com/2011/07/warwick-releases-jeroen-paul-thesselings-7-string-fretless-bass/ |title=Warwick releases Jeroen Paul Thesseling's 7-string fretless bass |publisher=Bassmusicianmagazine.com |date=2011-07-01 |accessdate=2018-05-30 |archive-date=2018-06-12 |archive-url=https://web.archive.org/web/20180612143538/https://bassmusicianmagazine.com/2011/07/warwick-releases-jeroen-paul-thesselings-7-string-fretless-bass/ |url-status=dead }}][{{cite web|last=Johnson |first=Kevin |url=http://www.notreble.com/buzz/2011/11/17/ultra-low-an-interview-with-jeroen-paul-thesseling/ |title=Ultra Low: An Interview with Jeroen Paul Thesseling |publisher=Notreble.com |date=2011-11-17 |accessdate=2018-05-24}}][{{cite web|last=Beller |first=Bryan |url=http://www.bassplayer.com/artists/machines-of-death-four-extreme-metal-bassists-lay-out-their-weapons-of-choice |title=Machines of Death: Four Extreme Metal Bassists Lay Out Their Weapons of Choice |publisher=Bassplayer.com |date=2012-05-11 |accessdate=2018-05-26}}] In late 2014, he founded the jazz fusion group Salazh Trio[{{cite web|last=Kennelty |first=Greg |url=http://www.metalinjection.net/latest-news/ex-obscura-bassist-has-a-new-fusion-trio-named-salazh-trio |title=Ex-Obscura Bassist Has A New Fusion Trio Named Salazh Trio |publisher=Metalinjection.net |date=2015-05-21 |accessdate=2018-05-24}}] featuring legendary Cuban drummer/percussionist [[Horacio Hernández]]. Their debut work ''Circulations'' was released in December 2017.[{{cite web|last=Staff |first=Drummerszone.com |url=https://drummerszone.com/news/horacio-el-negro-hernndez-new-salazh-trio-album/artist-news-1-13598/article/ |title= Horacio 'El Negro' Hernández' new Salazh Trio-album |publisher=Drummerszone.com |date=2017-12-18|accessdate=2017-12-18}}][{{cite web|last=D'Auria |first=Jon |url=http://www.bassplayer.com/artists/jeroen-paul-thesseling-and-the-salazh-trio-reveal-debut-album |title=Jeroen Paul Thesseling and the Salazh Trio Reveal Debut Album |publisher=Bassplayer.com |date=2018-04-04 |accessdate=2018-05-24}}][{{cite web|last=Amador |first=Valery |url=https://www.bassmusicianmagazine.com/2017/12/bassist-jeroen-paul-thesselin-news-salazh-trio-debut-album-circulations/ |title= Bassist Jeroen Paul Thesseling - Salazh Trio releases debut album 'Circulations' |publisher=Bassmusicianmagazine.com |date=2017-12-26 |accessdate=2017-12-26}}] In October 2019, he founded the instrumental progressive metal-fusion quartet Quadvium with fellow fretless bass player [[Steve Di Giorgio]].[{{cite web|author=Blabbermouth.net Staff |url=https://www.blabbermouth.net/news/testament-ex-obscura-bassists-team-up-in-quadvium/|title=Testament and former Obscura bassists team up in Quadvium |publisher=Blabbermouth.net |date=2019-11-02 |accessdate=2019-12-09}}][{{cite web|last=Staff |first=Bassmagazine.com |url=https://www.bassmagazine.com/artists/bassists-steve-di-giorgio-and-jeroen-paul-thesseling-create-new-group-quadvium |title= Bassists Steve Di Giorgio and Jeroen Paul Thesseling create new group Quadvium |publisher=Bassmagazine.com |date=2019-10-31 |accessdate=2019-10-31}}][{{cite web|last=Staff |first=Notreble.com |url=https://www.notreble.com/buzz/2019/11/03/steve-di-giorgio-and-jeroen-paul-thesseling-announce-new-band/|title= Steve Di Giorgio and Jeroen Paul Thesseling announce new band |publisher=Notreble.com |date=2019-11-03 |accessdate=2019-11-03}}] From 2020 till 2022 Jeroen rejoined the German technical death metal band [[Obscura (band)|Obscura]] after a nine-year break.[{{cite web|last=Staff |first=Bassmagazine.com |url=https://bassmagazine.com/artists/jeroen-paul-thesseling-the-7-string-fretless-master-returns |title= Jeroen Paul Thesseling: The 7-string fretless master returns |publisher=Bassmagazine.com |date=2022-03-22 |accessdate=2022-05-15}}][{{cite web|last=Staff |first=Bassmagazine.com |url=https://www.bassmagazine.com/artists/fretless-bassist-jeroen-paul-thesseling-rejoins-obscura |title= Fretless bassist Jeroen Paul Thesseling rejoins Obscura |publisher=Bassmagazine.com |date=2020-04-29 |accessdate=2020-04-29}}][{{cite web|author=Blabbermouth.net Staff |url=https://www.blabbermouth.net/news/bassist-jeroen-paul-thesseling-rejoins-obscura/|title=Bassist Jeroen Paul Thesseling rejoins Obscura |publisher=Blabbermouth.net |date=2020-04-30 |accessdate=2020-04-30}}][{{cite web|last=Staff |first=Notreble.com |url=https://www.notreble.com/buzz/2020/04/30/jeroen-paul-thesseling-rejoins-obscura/|title= Jeroen Paul Thesseling rejoins Obscura |publisher=Notreble.com |date=2020-04-30 |accessdate=2020-04-30}}] With them, he recorded their sixth studio album ''[[A Valediction]]'' (2021).[{{Cite web|last=Blabbermouth|date=2021-06-16|title=OBSCURA Announces 'A Valediction' Album|url=https://www.blabbermouth.net/news/obscura-announces-a-valediction-album/|access-date=2021-06-16|website=Blabbermouth.net}}][{{cite web|last=Staff |first=Notreble.com |url=https://www.notreble.com/buzz/2021/12/06/obscura-releases-a-valediction-with-jeroen-paul-thesseling/|title= Obscura Releases “A Valediction” With Jeroen Paul Thesseling |publisher=Notreble.com |date=2021-12-06 |accessdate=2022-01-03}}] In 2024 Quadvium finished their much anticipated recordings and released the debut studio album ''Tetradōm'' (2025) via Agonia Records. [{{Cite web|last=NoTreble|date=2025-04-05|title=A Bass Dream Realized: Steve Di Giorgio & Jeroen Paul Thesseling’s Vision Comes to Life on “Tetradom” |url=https://www.notreble.com/buzz/2025/04/05/a-bass-dream-realized-steve-di-giorgio-jeroen-paul-thesselings-vision-comes-to-life-on-tetradom/ |access-date=2025-04-25|website=Notreble.com}}][{{Cite web|last=Blabbermouth|date=2025-04-24|title=Steve Di Giorgio and Jeroen Paul Thesseling Bring The Dual Fretless Bass Player Concept To Life In QUADVIUM |url=https://blabbermouth.net/features/steve-digiorgio-and-jeroen-paul-thesseling-bring-the-dual-fretless-bass-player-concept-to-life-in-quadvium |access-date=2025-04-24|website=Blabbermouth.net}}] Jeroen lives in Amsterdam, the Netherlands. [{{cite web|last=Staff |first=Bassmagazine.com |url=https://bassmagazine.com/artists/bass-magazine-lockdown-check-in-with-jeroen-paul-thesseling |title= Bass Magazine Lockdown Check-In With Jeroen Paul Thesseling |publisher=Bassmagazine.com |date=2020-06-03 |accessdate=2020-08-09 |website=Bassmagazine.com}}] |