"The Rosenkavalier" is an opera composed by Richard Strauss with a libretto by Hugo von Hofmannsthal. Premiering in 1911, it is set in 18th-century Vienna and tells the story of a love triangle involving the aging noblewoman Octavian, the young Sophie, and the wealthy Baron Ochs. The opera explores themes of love, time, and social class. The work is known for its lush orchestration and beautiful melodies, particularly the famous trio in the final act. It combines elements of comedy and drama, showcasing the complexities of relationships and the passage of time through its rich character development and engaging plot.