Helloween

Helloween emerged in Hamburg in 1984 and helped define German power metal with Walls of Jericho and, later, Keeper of the Seven Keys: Part I and II, released in 1987 and 1988.

After Kai Hansen and Michael Kiske left, the band went through lineup changes and carried on with Andi Deris on vocals. In 2017, Hansen and Kiske returned for the Pumpkins United tour; the expanded lineup stayed in the group.