Brokeback Mountain was made into a film in 2005, starring the late Heath Ledger on the left and Jake Gyllenhaal. An opera version is due out in 2013.

Brokeback Mountain, the short story by Annie Proulx that spawned the 2005 movie, is to be adapted into an opera.

The New York City Opera announced Sunday it had commissioned Charles Wuorinen to compose a piece based on the 1997 story, which became the basis for the Ang Lee-directed film. 

"Ever since encountering Annie Proulx's extraordinary story I have wanted to make an opera on it, and it gives me great joy that Gerard Mortier and New York City Opera have given me the opportunity to do so," Wuorinen said in a statement.

The opera will open in spring 2013.

Proulx's story chronicles a 20-year love affair between two Wyoming ranch-hands who first meet on the fictional mountain in 1963.

The story won a third-place O. Henry Award in 1998 and The New Yorker garnered a National Magazine Award for Fiction for its publication of the short story that same year.

The movie, shot in Alberta and starring the late Heath Ledger and Jake Gyllenhaal, captured three Academy Awards including best adapted screenplay, original score and best direction.

This marks a second New York City Opera adaptation for Wuorinen.  Back in 2004, he transformed Salman Rushdie's novel, Haroun and the Sea of Stories, for the stage.

Wourinen, 70, is no stranger to creating new compositions. In 1970 he became the youngest composer to win the Pulitzer Prize in music for Time's Encomium, an electronic piece written on commission.

He co-founded the Group for Contemporary Music, one of the most prestigious ensembles dedicated to performance of new chamber music in the U.S.  It has also commissioned hundreds of new works since its inception in 1962.

With files from the Associated Press