Guillaume Tell Overture - Rossini
Gioachino Rossini (1792-1868) was an Italian composer whose career spanned the classical and early romantic periods.
Guillaume Tell (William Tell) was completed in 1829.
To learn more about the composer, visit Gioachino Rossini on Wikipedia.
For more on the composition, visit Guillaume Tell on Wikipedia.
Performance
Rossini: Wilhelm Tell – Ouvertüre ∙ hr-Sinfonieorchester ∙ Christoph Eschenbach
Excerpts
Guillaume Tell audio excerpts with orchestra are available on tromboneexcerpts.org.
Trombone Parts and Full Score
The full score of Guillaume Tell 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.
The rombone part is available on IMSLP.org as follows:
Ranges and clefs by Part

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