Not scored after the fact, nor about music. But movies in which a movies narrative was born from a song or music.
The two first ones I can think of: Sean Penn’s the Indian Runner which was based on a Bruce Springsteen song. And Bernard Rose’s Immortal Beloved from Beethoven.
Three other suggestions… – Paul Thomas Anderson wrote the script for Magnolia (1999) based on a few songs from Aimée Mann… – In a more distant way, David Lynch’s Blue Velvet (1986). – And in an even more distant way John Ford’s She Wore a Yellow Ribbon (1949).
It seems like you're not thinking along the lines of musicals, so I'm not sure if this will be relevant, but, as everyone knows, the plot and characters in Across the Universe (2007) are derived entirely from Beatles songs. Same with Mamma Mia and ABBA. – Felicia7 years ago
The film "Amadeus" based on Mozart's music – Amena Banu7 years ago