Symphony No. 1 - Brahms
Johannes Brahms (1833-1897), was a German composer of the Romantic era who used trombones sparingly but strategically.
Brahms completed Symphony No. 1 in 1876. The trombone section is used sparingly in Symphony No. 1 but does have quiet but exposed passages in the last two movements.
To learn more about the composer, visit Johannes Brahms on Wikipedia.
For more on the composition, visit Brahms Symphony No. 1 on Wikipedia.
Performance
Brahms - Symphony No.1 (Karajan, 1987)
Excerpts
Brahms Symphony No. 1 audio excerpts are available on tromboneexcerpts.org.
Trombone Parts and Full Score
The full score of Symphony No. 1 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 Brahms
Trombone Resources playlist of Brahms with Trombones in the instrumentation.