For writer-director David O. Russell, getting the music just right is a huge part of making movies.

'American Hustle' director David O. Russell's musical musings - latimes.com

"Good Times, Bad Times," the first track from Zeppelin's self-titled debut album, had never been licensed for a movie before Russell used it in "The Fighter" — "much to my glee," he recalled during a recent installment of the Envelope Screening Series, at which he discussed the importance of music in his films, including his latest, "American Hustle."