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The Blues Brothers is a 1980 American musical comedy film directed by John Landis. It stars John Belushi and Dan Aykroyd as "Joliet" Jake and Elwood Blues, characters developed from "The Blues Brothers" musical sketch on the NBC variety series Saturday Night Live. The film's screenplay was written by Aykroyd and Landis. It features musical numbers by rhythm and blues (R&B), soul, and blues singers James Brown, Cab Calloway, Aretha Franklin, Ray Charles, and John Lee Hooker.

The characters, Jake and Elwood Blues, were created by Belushi and Aykroyd in performances on Saturday Night Live. The name "The Blues Brothers" was the idea of Howard Shore. The fictional back story and character sketches of blood brothers Jake and Elwood were developed by Aykroyd in collaboration with Ron Gwynne, who is credited as a story consultant for the film. As related in the liner notes of the band's debut album, Briefcase Full of Blues, the brothers grew up in an orphanage, learned the blues from a janitor named Curtis, and sealed their brotherhood by cutting their middle fingers with a steel string said to have come from the guitar of Elmore James.  Belushi had become a star in 1978 as a result of both the Blues Brothers' musical success and his role in National Lampoon's Animal House. At one point, he managed the triple feat of being the star of the week's top-grossing film, top-rated television show, and singing on the number-one album within a year. When Aykroyd and Belushi decided they could make a Blues Brothers film, the bidding war was intense. Universal Studios narrowly beat Paramount Pictures for the project. John Landis, who had directed Belushi in Animal House, was aboard as director.  However, the project had neither a budget nor a script. On the former issue, Universal head Lew Wasserman thought the film could be made for $12 million; the filmmakers wanted $20 million. It would be impossible to settle on a specific amount without a screenplay to review, and after Mitch Glazer declined to help him, Aykroyd wrote one on his own.  Aykroyd had never written a screenplay before, as he admitted in the 1998 documentary, Stories Behind the Making of The Blues Brothers, or even read one, and he was unable to find a writing partner. Consequently, he put together a very descriptive volume that explained the characters' origins and how the band members were recruited. His final draft was 324 pages, which was three times longer than a standard screenplay, written not in a standard screenplay format, but more like free verse. To soften the impact, Aykroyd made a joke of the thick script and had it bound with the cover of the Los Angeles Yellow Pages directory for when he turned it in to producer Robert K. Weiss. Landis was given the task of editing the script into a usable screenplay, which took him about two weeks.  The overriding plot premise was unrealistic: religious groups and other not-for-profit organizations are typically exempt from federal or state taxes; although a legislative proposal to tax such property was under consideration in Illinois at the time.
The Blues Brothers (film)