Helloween is a German power metal band founded in the mid 1980s by members of Iron Fist and Powerfool. The band was a pioneering force in the European Power Metal movement and their second and third studio albums, Keeper of the Seven Keys, Pt. 1 and Pt.2, are considered masterpieces of the genre. Since its creation, the band has released thirteen studio albums and has undergone numerous line-up changes. Former members have gone on to found numerous bands, including Gamma Ray, Iron Savior and Masterplan.