The neat thing about the soundtrack to the Truman Show is that it isn't just written by one composer. If you look at the credits on the soundtrack CD, you'll see that at least three musicians contributed to it. The Truman Show is one of my favorite soundtracks. I don't care much for modern symphonic musical trends.
Classical music is called by that name because it has stood the test of time.
I could be wrong, but that's my opinion. But I do think that the legacy of great classical composers like Beethoven, Bach, Vivaldi, Mozart, Brahms, etc. is still being carried on today by film composers. But my soundtrack collection is growing more rapidly than the rest. John Williams and James Horner are right up there in my book with Bach and Vivaldi. If I think about it, it makes sense.