Please answer the following question: - years active is 1989 -- present    - genre is jam rock , stoner rock rock , progressive rock , krautrock , space        - background is group_or_band    - website is http://www.trigon.in/    - current members is rainer -rrb- rudi metzler -lrb- since 2009 -rrb- lange -lrb- founder -rrb- stefan lange -lrb- founder    Given the details above, guess who could this information be about.
A:
trigon -lrb- german band -rrb-