Given the question: - years active is 1984 -- present    - landscape is yes    - origin is hamburg , germany    - label is noise music , nuclear blast , steamhammer/spv , rca , emi , castle , sony    - genre is power metal , speed metal , heavy metal      - image size is 250px    - background is group_or_band    - image is helloween 's current line-up . jpg    - associated acts is gamma guardian , freedom call , bassinvaders , pink cream 69 ray , unisonic , hammerfall , iron savior , masterplan , blind    Given the details above, guess who could this information be about.
The answer is:
helloween