Conversation so far:
Who was an opponent of Richard Wagner
Eduard Hanslick
any one else an opponent of Richard Wagner besides Hanslick
Charles-Valentin Alkan
who supported Richard Wagner?
Wagner's followers (known as Wagnerians or Wagnerites) have formed many societies dedicated to Wagner's life and work
was brahms one of wagner's competitors
For a time, German musical life divided into two factions, supporters of Wagner and supporters of Johannes Brahms;
What kind of music did Richard Wagner make
Operas (or, as some of his mature works were later known, music dramas
Did Richard Wagner work with other people or solo
He worked with other people. Wagner was a German composer, dramatist, theatre director, polemicist, and conductor.
were the people Richard Wagner worked with included in his supporters

Question: what countries did he work in
Self-contained rewrite: what countries did Richard Wagner work in