<P> From the beginning, Chazelle wanted the film's musical numbers to be filmed "head to toe" and performed in a single take, like those of the 1930s works of Fred Astaire and Ginger Rogers . He also wanted the film to emulate the widescreen, CinemaScope look of 1950s musicals such as It's Always Fair Weather . Consequently, the movie was shot on celluloid film (not digitally) with Panavision equipment in a widescreen format, but not true CinemaScope as that technology is no longer available . </P> <P> Chazelle wanted Los Angeles to be the primary setting for his film, commenting that "there is something very poetic about the city I think, about a city that is built by people with these unrealistic dreams and people who kind of just put it all on the line for that ." Principal photography on the film officially began in the city on August 10, 2015, and filming took place in more than 60 locations both in and near Los Angeles, including the Angels Flight trolley in downtown, houses in the Hollywood Hills, the Colorado Street Bridge, the Rialto Theatre in South Pasadena, the Warner Bros. studio lot, the Grand Central Market, Hermosa Beach's Lighthouse Cafe, Chateau Marmont Hotel, and the Watts Towers, with many scenes shot in one take . It took 40 days to complete shooting, finishing in mid-September 2015 . </P> <P> The opening pre-credits sequence was the first to be shot, and was filmed on a closed - off portion of two carpool direct connector ramps of the Judge Harry Pregerson Interchange, connecting the I - 105 Carpool Lane to the I - 110 Express Lanes, leading to Downtown Los Angeles . It was filmed in a span of two days, and required over 100 dancers . For this particular scene, Chazelle wanted to give a sense of how vast the city is . The scene was originally planned for a stretch of ground - level highway, until Chazelle decided to shoot it in the 105--110 interchange, which arcs 100 feet (30 m) in the air . Production designer David Wasco said, "I thought somebody was going to fall off and get killed ." Not every portion of the highway was blocked . Chazelle compared the scene to the yellow brick road leading to the Emerald City in The Wizard of Oz (1939). </P> <P> Chazelle scouted for "old L.A." locations that were in ruins, or were perhaps razed . One such example was the use of the Angels Flight trolley, built in 1901 . The funicular had been closed in 2013 after a derailment . Attempts were made to repair and re-open the railway, but to no avail . However, the production team was able to secure permission to use it for a day . Chazelle and his crew then arranged to have it run for shooting (it was re-opened to the public in 2017). Mia works at a coffee shop on the Warner Bros. studio lot; Chazelle considered studio lots to be "monuments" of Hollywood . Production designer Wasco created numerous fake old film posters . Chazelle occasionally created names for them, deciding to use the title of his first feature, Guy and Madeline on a Park Bench (2009) for one poster, which reimagines it as a 1930s musical . </P>

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