Rob Roy is an operetta by composer Reginald De Koven and lyricist Harry B. Smith, frequent collaborators, loosely based upon the life of Scottish folk hero Robert Roy MacGregor, better known as Rob Roy, and the Walter Scott novel about him.
Rob Roy, designated "A Romantic-Comic Opera in 3 Acts", opens with a formal overture. The history-conflating plot covers the adventures of Rob Roy, a highland chieftain secretly married to the daughter of the mayor of Perth, and Bonnie Prince Charlie, the young pretender to the throne of Scotland, who in reality didn't set foot in Scotland until 11 years after the MacGregor's death. It included several songs in imitation of Scottish folk tunes.[1]