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.

Question: Who else?
Self-contained rewrite: Other than Anton Bruckner and Hugo Wolf, who else was indebted to Wagner?