The song "Rock Around the Clock" became a hit after featuring in the opening credits of which film?

"Blackboard Jungle" is a 1955 social commentary film about teachers in an interracial inner-city school, based on the novel The Blackboard Jungle by Evan Hunter and adapted for the screen and directed by Richard Brooks. It is remembered for its innovative use of rock and roll in its soundtrack and for the unusual breakout role of a black cast member, future Oscar winner and star Sidney Poitier as a rebellious, yet musically talented student.

The film marked the rock and roll revolution by featuring Bill Haley & His Comets' "Rock Around the Clock", initially a B-side, over the film's opening credits (with a lengthy drum solo introduction, unlike the originally released single), as well as in the first scene, in an instrumental version in the middle of the film, and at the close of the movie, establishing that song as an instant hit. The record had been released the previous year, gaining only limited sales. But, popularized by its use in the film, "Rock Around the Clock" reached number one on the Billboard charts, and remained there for eight weeks.