Phil, a part-time truck driver and singer who wears his pants far too high, meets a feisty platinum blonde who challenges him to a drag race through Griffith Park. When he is caught and loses his license, he meets up with the sketchy Frank Wooster who offers him a job singing in his new nightclub. When Phil discovers that his new job also includes drug running, he must fight to save his friends and himself.

A frustrated big-band promoter runs in to rock-and-rollers Bill Haley and the Comets at a small-town dance. He quickly becomes their manager and, with the help of Alan Freed, hopes to bring the new sound to the entire country. But will a conniving booking agent, with a personal ax to grind with the manager, conspire to keep the band from making the big time?