In the filmmaking process, a "temp track" is sometimes utilized during a rough edit before the score is composed, using existing music to support a scene. Sometimes this is done hoping to actually license that music, and sometimes it's just the director or producers trying to convey what they're looking for from the composer. Either way, the music that ends up being written for the movie can often be heavily influenced by and end up sounding a lot like the music used as a temp track. The Planets (in particular Mars, The Bringer of War) has been used as a temp track on countless films.

Edit: typo corrected