Benjamin Wallfisch was hired in March 2017 to composed the film's musical score.

The locations for It were in the Greater Toronto Area, including Port Hope, Oshawa, and Riverdale.

Principal photography began in Toronto on June 27, 2016, and ended on September 21, 2016. During the development, the film was moved to New Line Cinema division. He talks of drawing inspiration from 1980s films such as The Goonies (1985), Stand by Me (1986) and Near Dark (1987). After being dropped out as the director in May 2015, Andy Muschietti was signed on to direct the film in June 2015. started discussing that they would be bringing it to the big screen, with David Kajganich plannned to direct, before being replaced by Cary Fukunaga in June 2012. Development of the theatrical film adaptation of It began in March 2009 when Warner Bros.

It is the first film in the It film series as well as being the second adaptation following Tommy Lee Wallace's 1990 miniseries. Set in Derry, Maine, the film tells the story of The Losers' Club, a group of seven outcast children who are terrorized by the eponymous being which emerges from the sewer, only to face their own personal demons in the process. The film stars Bill Skarsgård, Jaeden Lieberher, Jeremy Ray Taylor, Sophia Lillis, Finn Wolfhard, Wyatt Oleff, Chosen Jacobs, Jack Dylan Grazer, Nicholas Hamilton, and Jackson Robert Scott. It is the first of a two-part adaptation of the 1986 novel of the same name by Stephen King, primarily covering the first chronological half of the book. The film was produced by New Line Cinema, KatzSmith Productions, Lin Pictures, and Vertigo Entertainment. It (titled onscreen as It Chapter One) is a 2017 American supernatural horror film directed by Andy Muschietti and written by Chase Palmer, Cary Fukunaga and Gary Dauberman.

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