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)"): The band is known as one of the most prominent bands of the German heavy metal scene.
Relevant evidence: No