Das Rheingold - Wagner
Richard Wagner (1813-1883), was a German composer of the Romantic era.
Wagner completed Das Rheingold in 1854.
To learn more about the composer, visit Richard Wagner on Wikipedia.
For more on the composition, visit Wagner - Das Rheingold on Wikipedia.
Performance
Excerpts
Wagner - Das Rheingold audio excerpts are available on tromboneexcerpts.org.
Trombone Parts and Full Score
The full opera score of Das Rheingold is available on IMSLP.org.
NOTE: IMSLP provides access to public-domain scores and parts, with copyright status varying by country. Users are responsible for observing applicable copyright laws.
Trombone parts are available on IMSLP.org as follows:
Ranges and clefs by Part

More Wagner
Trombone Resources playlist of Wagner with Trombones in the instrumentation.