John Williams (b. 1932) is perhaps the most famous and accomplished composer alive today. His fame rests on the dozens of movie scores he has composed, including the entire Star Wars saga, the Indiana Jones series, and the initial Harry Potter films. Like so many of the characters he scores, there is quite a rich back story, including a jazz career as Johnny Williams and a Sinfonietta for Winds and Percussion from the 60s. There is no denying, though, that his film scores have been front and center in his career. For more, visit this John Williams fan website or Wikipedia.
Raiders March is the main theme music for the Indiana Jones series of films. It was written for the release of the first film in the series, Raiders of the Lost Ark, in 1981. (More at IMDB and Rotten Tomatoes). This film follows the adventures of Indiana Jones, a 1930s archaeologist and explorer who finds himself face to face with mystical treasures and Nazis all over the world (when not assigning reading at his cushy university post). It was an instant hit, the highest grossing film of 1981, and a winner of multiple awards. The theme music has become an iconic representation of adventure for generations of moviegoers. The full Raiders March appears for the first time in the end credits of Raiders of the Lost Ark, but its themes are used throughout the film.
Here is the original orchestra version (from the 4th film, 2008s Indiana Jones and the Kingdom of the Crystal Skull):
The most complete band version comes from arranger Paul Lavender, played here by the US Marine Band, with John Williams himself conducting:
Paul Lavender also created a grade 3 version:
See more about Raiders March at Indiana Jones Wiki, Wikipedia, J. W. Pepper, and Alfred Music (Grade 1 version).