MADRID (AP) — It was a short story, then a Hollywood movie. Now the tragic tale of two cowboys in love is being reinvented again as “Brokeback Mountain” — the opera.

Ahead of its world premiere Tuesday in Madrid, author Annie Proulx told The Associated Press that opera presented an chance to explore the complexities of the tale in a way that neither her own story nor the movie by director Ang Lee were able to do.