This film premiered in December 1977, and the soundtrack album became the biggest selling of all time. Which film?

The film that premiered in December 1977, featuring a soundtrack that became the biggest selling of all time, was *Saturday Night Fever*. This iconic dance drama, starring John Travolta as Tony Manero, first hit theaters on December 12, 1977, in New York City, and December 14 in Los Angeles. It quickly became a cultural phenomenon, capturing the essence of the disco era and its impact on working-class youth in Brooklyn. The film's raw portrayal of social tensions and the escapism found on the dance floor resonated deeply with audiences.

The accompanying soundtrack album, released a month prior to the film in November 1977, was a monumental success. Dominated by the Bee Gees, with hits like "Stayin' Alive," "Night Fever," and "How Deep Is Your Love," it went on to sell over 40 million copies worldwide, making it the best-selling album in music history at the time, only later surpassed by Michael Jackson's *Thriller*. The album spent an astonishing 24 consecutive weeks at the top of the U.S. charts, solidifying disco's mainstream appeal.

Beyond its commercial triumphs, *Saturday Night Fever* had a profound influence on popular culture, making John Travolta a household name and popularizing disco music and fashion globally. The film and its soundtrack are credited with revolutionizing movie and music marketing, demonstrating the powerful synergy between the two. Recognized for its cultural significance, *Saturday Night Fever* was selected for preservation in the United States National Film Registry by the Library of Congress in 2010.