final members ( 1986 - 2009 ) : bjørn jensen alias '' bertel '' -- guitar and vocals ( founding member ) , jarle farestveit alias '' hallstein '' -- accordion and vocals ( founding member ) , gunnar låstad alias '' ruball '' -- bass and vocals , arild totland alias '' belbert '' -- drums and vocals , øyvind østerbø alias '' øyvind '' -- guitar and vocals , gunnar polden -- light and sound technichan .