The first feature-length documentary about the Boston Marathon will include music performed by the Boston Symphony Orchestra, the filmmakers said Thursday. In town to meet with sponsors and supporters of the film, titled “Boston,” producers Megan Williams and Eleanor Bingham Miller and director Jon Dunham said the BSO has agreed to participate. The orchestra hasn’t recorded music for movies often — “Mystic River” is one soundtrack that does feature the BSO — but for the Marathon documentary it will record music being composed by Jeff Beal, an Emmy-nominated composer whose credits include the film “Pollock” and the TV series “House of Cards” and “The Newsroom.” Scheduled to premiere in Boston in April 2017, “Boston” will tell the story of the historic road race dating to its origin in 1897, paying particular attention to the participation of women runners. (This year marks the 50th anniversary of women being allowed to run.) If you’re wondering if that means Rosie Ruiz will get a mention in the movie, it does. Ruiz was declared the winner of the 1980 race, though it was later revealed that she didn’t run the entire course. Canada’s Jacqueline Gareau, the actual winner, will be in the film, as will great marathoners Bill Rodgers, Johnny Kelley, Kathrine Switzer — the first woman to run with an official bib number — and two-time winner Joan Benoit Samuelson.