The more I watch it, the more I realize music is the real script for 2001. It says everything the day-to-day nature of the dialogue doesn't. It celebrates how wondrous things are when man puts technology to good use, but its absence underscores how cold, ominous and just plain WRONG things are when HAL enters the film. HAL's last moments being an attempt to sing isnt some happy minor accident: its his, and to a point, mankind's complete lack of a soul being laid out for all to hear. Even the dissonance of the monolith scenes, its only dissonant because its hundreds of powerful voices singing, but with no order to make it harmonic. Which,I've always thought, is why the....whatevers...that made the monolith helped us to begin with. They kinda need us.