|Image via Wikipedia|
This tradition goes back a long time. Sergei Prokofiev is one of the Twentieth Century's greatest composers, and his music in many ways led the charge to the cinema. Prokofiev composed most of his greatest works in Soviet Russia immediately before and during the Great Patriotic War of 1941-1945. The Soviet regime was desperate to build patriotic feeling in the masses, and the new film medium gave them a mass propaganda outlet.
Just as Adolf Hitler had his film maker Leni Riefenstahl, so Stalin had his in Sergei Eisenstein. 1938 saw the release of Eisenstein's great Alexander Nevsky, featuring Prokofiev's score. The film told the tale of the Teutonic Knights, and how their invasion was turned back by the early Russian hero Nevsky. This is a scene from the film.
The entire Film art was still half in the old stage theater production mindset, and so this looks stiff to our modern eye - much as Laurence Olivier's Henry V seems stiff and staged. But the music is grand.
No, Classical Music isn't dead at all. It just goes with popcorn these days.