I find it almost impossible to define classical music, other than, "I know it when I hear it." Even that is subjective, of course. Why is it OK for WCLV to play an arrangement of Yesterday played by a classical guitarist, or one played by The Cleveland Orchestra at Blossom, but it is not OK to play the original Beatles' song, which in many ways is better than the other arrangements.
WCLV often plays movie music, and I am OK with that. But when I tune in to WCLV and hear movie music playing, I can nearly always tell that it is movie music. It is different from what I consider to be real classical music. Of course there are exceptions; for example most people don't even know that Prokofiev's Lt. Kije is movie music. And real classical music is frequently used in movies.
My view on "classical" movie music goes back to the original "Wow, that sounds a lot like classical music!" movie. Yes, I mean Star Wars. I remember seeing The Empire Strikes Back, sitting on the edge of my seat and drawn into the riveting music, which seemed even better than the first movie. I ran out and bought the movie soundtrack recording the next day. After listening to the whole album--both sides!--I realized that the music didn't stand on its own. Everybody likes the main theme, of course, and it's hard not to be stirred by the Imperial March. But the rest of it was not that interesting.
I believe that is the way it should be. Movie music is meant to set the mood for a scene, not to steal it. Some of it can be set to a suite for performance, but it is usually more appropriate for a pops concert than a classical concert.
Last summer we went to Blossom for the showing of Raiders of the Lost Ark, mainly because it was the end of summer and we still had some passes left from our lawn ticket book. I was not surprised to see that it was the most popular Cleveland Orchestra concert we had attended that summer. The orchestra performed flawlessly; from our seats on the lawn we couldn't tell that we were hearing the orchestra instead of the movie soundtrack. But what a waste of the Cleveland Orchestra's talents!