Dancers gather on a ballroom floor to waltz. Unbeknownst to them some spirits from beyond have heard the dance music and joined them on the dance floor. Look at the photo carefully that some eagle-eyed photographer snapped and you can actually see the apparitions whirling to the music next to human dancers.
Two themes are presented by the orchestra--the 1st by the clarinet at 0:13 ; the 2nd by the English Horn at 0:45. The two themes are then combined at 1:40 .