Question: What school of composers was attended by the composer whose operas were considered the only German ones more important than "Die Soldaten" by Bernd Alois Zimmermann?
Sentence (from "Die Soldaten"): Die Soldaten ("The Soldiers") is a four-act opera in German by Bernd Alois Zimmermann, based on the 1776 play by Jakob Michael Reinhold Lenz.
Relevant evidence: No