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?
Bernd Alois Zimmermann:  He is perhaps best known for his opera "Die Soldaten", which is regarded as one of the most important German operas of the 20th century, after those of Berg. Alban Berg: Alban Maria Johannes Berg ( ; ] ; February 9, 1885 – December 24, 1935) was an Austrian composer of the Second Viennese School.
i don't know