Please answer the following question: What key details about helloween can be extracted from the following bio? Bio: helloween is a german power metal band founded in 1984 in hamburg , northern germany . the band is a pioneering force in the power metal genre and their second and third studio albums , '' keeper of the seven keys part i '' and '' part ii '' , are considered masterpieces of the genre . twelve musicians have been a part of the band 's line-up in its history , which has consisted of singer andi deris , guitarists michael weikath and sascha gerstner , bass guitarist markus grosskopf , and drummer daniel loble since 2005 . helloween was formed in 1984 by members of bands iron fist , gentry , and powerfool . its first line-up consisted of weikath , grosskopf , singer and guitarist kai hansen , and drummer ingo schwichtenberg . after the release of a self-titled ep and a first album in 1985 , it expanded into a quintet when singer michael kiske joined , with hansen only acting as guitarist . under this line-up , they released the '' keeper of the seven keys '' albums -lrb- 1987 and 1988 -rrb- , which established helloween as a notable heavy metal band and led to the creation of the power metal subgenre . however , hansen left the band quickly after the release of '' part ii '' and was replaced by roland grapow . he then created the band gamma ray . helloween 's first two albums without hansen , '' pink bubbles go ape '' -lrb- 1991 -rrb- and '' chameleon '' -lrb- 1993 -rrb- , were commercial and critical failures , which created tensions between band members and led to the firing of schwichtenberg and the departure of kiske . they were replaced by uli kusch and andi deris respectively . the albums released under this line-up , consisting of '' master of the rings '' -lrb- 1994 -rrb- , '' the time of the oath '' -lrb- 1996 -rrb- , '' better than raw '' -lrb- 1998 -rrb- and '' the dark ride '' -lrb- 2000 -rrb- , received a warm reception from both fans and critics , gradually establishing helloween as a successful band again . however , tensions following the release of '' the dark ride '' led to the dismissals of...
A:
- 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