That movie showed that essentially Cuba was like Thereisienstadt, when American celebrities came to visit. They would trot out their musicians and show them how happy they were, and how free they were to play their music....but the moment they left...the government put the clamps down and forced them to play only the government sanctioned music.
That's the only way the Commie / Socialist system can exist. Everybody plays from the scores that concertmaster hands out. There is no id lib, improvisation or jammin' allowed. That kind of stuff makes the Conductor obsolete.