Wendy Carlos and Rachel Elkind wrote and performed a full electronic score for the film, but Stanley Kubrick discarded most of it and used a soundtrack of mostly classical music. Only the adaptation of Hector Berlioz’s “Symphonie Fantastique” during the opening credits, the music during the family’s drive to the hotel, and a few other brief moments (such as Halloran’s plane trip) survive in the final version. Wendy Carlos once noted that she’d like to see the original score released on CD, but there were too many legal snags at the time. As of 2005, Carlos’ score for the film has been remastered, and is a part of “Rediscovering Lost Scores Volumes 1 and 2”.
The famous opening scene was shot in Glacier National Park in Montana just north of St. Mary’s Lake. The road seen in the scene, Going-to-the-Sun Road, does actually close down during winter and is only negotiable by snowcat. Kubrick initially sent a second unit to the Rockies in Colorado, but they reported back that the area wasn’t very interesting. When Stanley Kubrick saw the footage they had shot, he was furious, and fired the entire unit. He then sent Greg MacGillivray, a noted helicopter cameraman, to Montana and it was McGillivray who shot the scene.
To achieve the smoothness of the opening shots, cameraman Greg MacGillivray secured a wide angle Arriflex camera to the front of a helicopter, then balanced the blades to remove any vibrations. Even the shot where the camera comes down behind the car, passes it out, and goes over the edge is done via the helicopter.