A Washington, D.C. , man arrested after playing music from "Star Wars" at federalized troops is suing for violating the First Amendment.

In a 17-page complaint filed Thursday, attorneys with the American Civil Liberties Union (ACLU) give the U.S. District Court for the District of Columbia a quick refresher on the John Williams-penned score to one of the most popular science fiction franchises of all time.

"In the Star Wars franchise, The Imperial March is the music that plays when Darth Vader or other dark forces enter a scene or succeed in their dastardly plans," the lawsuit begins. "It is also the soundtrack of Sam O'Hara's protest against the National Guard deployment in D.C."

The song is considered a theme, a non- diegetic piece of audio used as a refrain whenever certain sorts of

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