Principal photography on the film officially began in August 2015, and concluded in mid-September 2015. Filming took over eight weeks and was shot in more than 60 locations throughout LA, that included downtown trolley, houses in the Hollywood Hills, Angels Flight, Colorado Street Bridge, South Pasadena, Grand Central Market and Watts Tower. 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." The Film is presented in Cinemascope using the 2.55:1 aspect ratio, which was the aspect of the first CinemaScope features that only had a 4-track magnetic soundtrack. This later changed to 2.35:1 and 2.39:1 when an optical backup track was added. When projected on a screen in 2.39:1 ratio this feature has small black bars on top and bottom. Because Chazelle wanted to shoot the scene in the tradition of the old musicals without cuts or editing, Gosling, Stone and the cast had to learn to sing, play and dance themselves. Gosling, in particular, learned how to play the piano himself. By the time filming had begun, Gosling was able to play all of the piano sequences seen in the film without the use of a hand double or CGI. Gosling himself had no prior piano training. Chazelle then spent nearly a year with Hurwitz and editor Tom Cross on getting the tone and style just right. The film's score was recorded in the same studio where Singin' In The Rain, The Wizard of Oz, and many other MGM musicals were scored.
The film stars Ryan Gosling, Emma Stone and John Legend. The cast gave spectacular and stellar performances and musical numbers. Both Gosling and Stone pulled off show-stopping numbers that silenced my first initial skepticism. Both Gosling and Stone are delights, in their sheer energy and passion of being able to sing, dance and play until they drop. It's astounding. Though Legend brought the best musical number that brought a new vibe to Jazz.