Question: Which composer wrote both the libretto and the music for each of his stage works, Richard Wagner or Carl Maria von Weber?
Sentence (from "Richard Wagner"): Wilhelm Richard Wagner ( ; ] ; 22 May 181313 February 1883) was a German composer, theatre director, polemicist, and conductor who is primarily known for his operas (or, as some of his later works were later known, "music dramas").
Relevant evidence: Yes