"The US vs. John Lennon [ tickets ]," an upcoming documentary detailing the political side of the late pop legend's life, will be accompanied by a soundtrack album featuring 19 Lennon originals and two unreleased tracks.

The film, which is due in theaters Sept. 15, details Lennon's personal and political evolution between 1966 and 1976, as he transformed himself from a pop singer into a larger-than-life political icon. The documentary examines the US government's attempts to silence the singer through surveillance and threats of deportation, particularly during the Nixon administration.

"Never in a million years, did we think that promoting World Peace could be dangerous," Lennon's widow, Yoko Ono [ tickets ], said in a press release. "Were we naive? Yes, on that account, we were.

"John sings: 'Nobody told me there'd be days like these.' That was his true confession," Ono said. "These songs have become relevant all over again. It's almost as if John wrote these songs for what we are going through now."

The film's soundtrack, which will be made available both on CD and digitally Sept. 26, collects some of Lennon's most overtly political songs, including "Imagine," "Power to the People" and "Happy Xmas (War is Over)," as well as two tracks--"Attica State," recorded live at a 1971 benefit concert, and an instrumental version of "How Do You Sleep"--making their first appearance on a commercial collection.

The film, which mixes archival footage with contemporary interviews, was co-written, directed and produced by David Leaf and John Scheinfeld. Leaf wrote and directed the Showtime documentary "Beautiful Dreamer: Brian Wilson & the Story of Smile," which premiered on the cable network last fall, while Scheinfeld wrote and directed the documentary "Who is Harry Nilsson (and Why is Everybody Talkin' About Him?)," which is currently screening at film festivals across the country.

"I believe John would have loved this film," Ono said. "It's the kind of cool film he would have liked even if it were about somebody else. It's not tabloid, but rather it tells it like it was.

"If John were here today, he would have felt good about being represented by such a film, and the fact that we took the chance to make it and present it to the world."