Something I always thought was interesting...
In 1994, a compact disc was released called TRUTH AND FICTION that featured the soundtrack of PULP FICTION, intercut with interview audio drops from Quentin Tarantino. Now, say what you will about QT as a person and the relative originality or lack of originality in his films... but that guy knows music. His soundtracks have led me to discover more "classic" artists I'd never heard of than almost any single source I could ever cite. That said, there's this passage on the Truth and Fiction CD where QT talks about the importance of songs to set mood in films and how important it is to pick the absolutely right piece of music for a scene He then mentions that he would never, ever pick a piece of music for one of his movies that was ever used in someone else's movie and that even though he'd like to use, say, "Be My Baby" by The Ronettes, he never would because Martin Scorsese's "fuckin' MEAN STREETS owns that song." And I thought that was great! Always be original! "You tell 'em, QT!"
And then in 1997 with his next film, JACKIE BROWN, as we travel alongside Pam Grier along the airport's moving sidewalks, what is our opening credit sequence song? "Across 110th Street," by Bobby Womack. From the film, ACROSS 110TH STREET. (A different version of the song served as Across' opening theme, but then again the version used in Jackie Brown was, in fact, the version that served as the first track on the Across 110th Street soundtrack album.)
So, does using a different version of the song matter? Even if it's by the same performer and is the far-more heard and referred-to version?