Question: Future World" is a song and a single made by the German heavy metal band Helloween, it is performed frequently by Helloween and which power metal band from Hamburg, northern Germany, founded and fronted by Kai Hansen after his departure from the German power metal band Helloween?
Sentence (from "Gamma Ray (band)"): Hansen is the current lead vocalist, guitarist as well as the chief songwriter of Gamma Ray.
Relevant evidence: No