Conversation so far:
What influence Richard Wagner had?
Wagner inspired great devotion.
Are there any other interesting aspects about this article?
For a long period, many composers were inclined to align themselves with or against Wagner's music.
What else was known?
Anton Bruckner and Hugo Wolf were greatly indebted to him.
Who else?
as were Cesar Franck.
What else stood out in this article?
Amongst those claiming inspiration from Wagner's music are the German band Rammstein.

Question: What kind of music he made?
Self-contained rewrite: What kind of music did Richard Wagner make?