I just went to see "Beauty and the Beast" with a live orchestra. The movie was played on a screen with the orchestra performing the soundtrack.
I was sitting in a place where I could see the control screens used by the conductor and orchestra. It would display a few information over the movie and the beats, bars, etc.
One thing I don't understand is that the slow version of the main theme was in 6/8, and a more action oriented version of the same theme was in 4/4; what is the reason to have a different signature when, in practice, it was the same theme orchestrated differently?
Also, another thing I didn't understand is that a few of the dance songs (in the bar, if anyone remembers the movie) were in 2/4; but you could clearly hear the chord changes being every 2 bars, so it could have easily fit in 4/4; Does that mean the signature was chosen more to emphasis the beat and not the music itself? Is there a reason behind that choice?