John Williams
John Towner Williams (born February 8, 1932) is an American composer, conductor, and pianist. Regarded by many as the greatest film composer of all time, he has composed some of the most popular, recognizable, and critically acclaimed film scores in cinematic history in a career spanning over six decades. Williams has won 25 Grammy Awards, seven British Academy Film Awards, five Academy Awards, and four Golden Globe Awards. With 52 Academy Award nominations, he is the second most-nominated individual, after Walt Disney. In 2005 the American Film Institute selected Williams's score to 1977's "Star Wars" as the greatest film score of all time. The Library of Congress also entered the "Star Wars" soundtrack into the National Recording Registry for being "culturally, historically, or aesthetically significant".
John Williams
Williams has composed for many critically acclaimed and popular movies, including the "Star Wars" Skywalker saga, "Schindler's List", "Close Encounters of the Third Kind", "Superman", "E.T. the Extra-Terrestrial", the "Indiana Jones" series, the first two "Home Alone" films, the first two "Jaws" films, the first two "Jurassic Park" films, "Hook", and the first three "Harry Potter" films. Williams has also composed numerous classical concertos and other works for orchestral ensembles and solo instruments. He served as the Boston Pops' principal conductor from 1980 to 1993 and is its laureate conductor. He has been associated with director Steven Spielberg since 1974, composing music for all but five of his feature films. Other works by Williams include theme music for the 1984 Summer Olympic Games, "NBC Sunday Night Football", "The Mission" theme used by NBC News and Seven News in Australia, the television series "Lost in Space" and "Land of the Giants", and the incidental music for the first season of "Gilligan's Island". Williams was inducted into the Hollywood Bowl's Hall of Fame in 2000, and received a Kennedy Center Honor in 2004 and the AFI Life Achievement Award in 2016. He has composed the score for eight of the top 25 highest-grossing films at the U.S. box office (adjusted for inflation). His work has influenced other film composers and contemporary classical and popular music.
Star Wars: Episode III – Revenge of the Sith (soundtrack)
"Battle of the Heroes" is the theme for the climactic duel between Anakin Skywalker and Obi-Wan Kenobi, written upon the request of George Lucas. Lucas wanted a piece that would function as a tragic version of "Duel of the Fates" in the film's final fight scenes.
Star Wars: Episode III – Revenge of the Sith (soundtrack)
The concert suite begins with a soft and tense ostinato by the violas in tremolo. Stopped horns join in to present an initial statement of the theme, immediately followed by pulsing beats with mezzopiano double basses and cellos. The ostinato builds as the harp and trombones make their entrance. Suddenly, the horns, 1st violins, and choir play the theme at a louder dynamic level. The ostinato still plays beneath it all. Twice, the theme is interrupted by brief flurries of chaotic "action music". At a key moment, the "Force Theme" makes a forceful entrance in a minor key. After the piece's main theme is heard several more times, "Battle of the Heroes" culminates in a fortissimo tutti of repeated D minor chords. This false ending is followed by the viola ostinato again. Solo flute, oboe, English horn, clarinet, and horn in unison deliver a melancholic interpretation of the theme's third over the ostinato, which slowly dies away before landing on the tonic. The timpani rumble as the entire orchestra crescendos into a final D minor chord.

Question: "Battle of the Heroes" is a musical theme from a movie, that was written by which American composer, conductor, and pianist, with a career spanning over six decades?
Answer: John Towner Williams