Helloween are a German power metal band from Hamburg. Formed in 1984, the group was originally a quartet featuring Kai Hansen on lead vocals and guitar, Michael Weikath on guitar and backing vocals, Markus Grosskopf on bass and backing vocals, and Ingo Schwichtenberg on drums. The band's current lineup includes constant members Weikath and Grosskopf, alongside Hansen (who rejoined in 2016 after leaving in 1989), co-lead vocalists Michael Kiske (from 1986 to 1993, and since 2016) and Andreas "Andi" Deris (since 1994), rhythm guitarist and backing vocalist Sascha Gerstner (since 2002), and drummer Daniel "Dani" Löble (since 2005).