Wagner;s music definitely fits the words of the libretto to the music. He makes sure that everything he wrote in the libretto is well explained. That includes repeating the story from the beginning of the cycle,Das Rheingold. In this way a listener can appreciate what is happening without having seen the otheer opers in the cycle.
You say to describe the orchestra and singing in thios section. I am not sure which section you mean. There are both singing with orchestra and orchestral interludes. The interludes are designed to priovide cover for the changes of scenery. I hope I have answered your question.
