James Roy Horner is an American composer, orchestrator

Orchestration

Orchestration is the study or practice of writing music for an orchestra or of adapting for orchestra music composed for another medium...

 and conductor of orchestral and film music. He is noted for the integration of choral and electronic elements in many of his film score

Film score

A film score is original music written specifically to accompany a film, forming part of the film's soundtrack, which also usually includes dialogue and sound effects...

s, and for frequent use of Celtic musical elements

Celtic music

Celtic music is a term utilised by artists, record companies, music stores and music magazines to describe a broad grouping of musical genres that evolved out of the folk musical traditions of the Celtic people of Western Europe...

. His score to the 1997 film Titanic

Titanic (1997 film)

Titanic is a 1997 American epic romance and disaster film directed, written, co-produced, and co-edited by James Cameron. A fictionalized account of the sinking of the RMS Titanic, it stars Leonardo DiCaprio as Jack Dawson, Kate Winslet as Rose DeWitt Bukater and Billy Zane as Rose's fiancé, Cal...

remains the best selling orchestral film soundtrack of all time.

In addition, Horner has scored over 100 films, frequently collaborating with acclaimed directors such as Mel Gibson

Mel Gibson

Mel Colm-Cille Gerard Gibson, AO is an American actor, film director, producer and screenwriter. Born in Peekskill, New York, Gibson moved with his parents to Sydney, Australia when he was 12 years old and later studied acting at the Australian National Institute of Dramatic Art.After appearing in...

, James Cameron

James Cameron

James Francis Cameron is a Canadian-American film director, film producer, screenwriter, editor, environmentalist and inventor...

 and Ron Howard

Ron Howard

Ronald William "Ron" Howard is an American actor, director, and producer. He came to prominence as a child actor, playing Opie Taylor in the sitcom The Andy Griffith Show for eight years, and later the teenaged Richie Cunningham in the sitcom Happy Days for six years...

.