As well as songs inspired by movies, possibly the OP would be interested in songs about the movie business, or anyway the edges of it - for instance, going back to Al Stewart again, "Old Compton Street Blues" is about a teen wannabe movie star who falls instead into low-grade modelling and prostitution...I like the line "But money has its favourites and yours went back to them".
"Ah you must have been just fifteen when you made your mind up first
That you'd make it in the movies and you couldn't lose the thirst
And it took you to the attic where the Agent King holds Court
And his courtesans are fully paid up losers of a sort
He looks at you and tells you that you just might get the part
But you don't get things for nothing and he doesn't want your heart"