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Piotr Gruenpeter
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Member

2010- Thaw - moog noise  
2011- Mentor - bass (as Gusion's Drone)  
2024- Untervoid - bass (as Haldor Grunberg)  

Studio musician

2017 Dopelord - keyboards  
2021 Me And That Man - keyboards (as Haldor Grunberg)  

Live musician

2018 Untervoid - bass (as Haldor Grunberg)  

Guest musician

2015 Weedpecker - synthesizers (as Haldor Grunberg)  
2016 Moanaa - moog (as Haldor Grunberg)  
2017 Dom Zły - keyboards (as Haldor Grunberg)  
2018 Optical Sun - synthesizers (as Haldor Grunberg)  
2022 Witchfinder - vocals (as Haldor Grunberg)  

Personal information

Also known as: Haldor Grunberg, Gusion's Drone