Jeroen Paul Thesseling

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Jeroen Paul Thesseling
Background information
Born April 13, 1971
Genres Microtonal music
Contemporary classical
Death metal
Instruments Bass guitar
Years active 1991-Present
Associated acts Salazh Trio
Ensemble Salazhar
Notable instruments
Warwick basses

Jeroen Paul Thesseling is a Dutch fretless bass player, most famous for his work in the Dutch band Pestilence, German band Obscura and Dutch studio group Ensemble Salazhar.[1][2]


Thesseling began studying bass in 1988 at the ArtEZ School of Music in Enschede, Netherlands. During the period 1992-1994, he was a member of Pestilence, with whom he recorded the jazz/fusion-influenced album Spheres. In 1995 Thesseling 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, microtonal and contemporary classical music inspired him to focus primarily on fretless bass. In 2005 he recorded with the studio group Ensemble Salazhar. Despite their highly acclaimed demo 'Colors' the group never officially released recordings. Between 2007-2011, he collaborated with Obscura and recorded with them Cosmogenesis (2009) and Omnivium (2011). During the period 2009-2012 he rejoined Pestilence after a 15-year break and recorded their sixth studio album Doctrine (2011). Since 2011 German bass luthier Warwick built fretless 7-string instruments for him that are strung with a sub-contra F#-tuning. In 2013 he was invited to perform with the American Festival of Microtonal Music and became a member of their board in 2014. Later that same year he co-founded Salazh Trio, a jazz/ fusion group in the vein of the earlier studio project Ensemble Salazhar.


Jeroen is endorsed by Warwick and plays 6-string Thumb neck-through basses since 1993. From 2011 he uses 7-string fretless Thumb NT basses with a low F#-tuning.

Discography (selected)[edit]



  1. ^ Rivadavia, Eduardo. "Obscura". AllMusic. Retrieved 2011-12-15. 
  2. ^ Serba, John (2002-07-22). "Pestilence". AllMusic. Retrieved 2011-12-15. 

External links[edit]