A video has gone viral of an elderly ballerina who has Alzheimer's. She's sitting in a wheelchair wearing headphones, and when she starts to hear"Swan Lake"she begins moving her hands and arms as if she's back on stage dancing again.
(Here's the video. It's from 2019 and her name is Marta Cinta González Saldaña. It's wonderful, although the isn't entirely correct. She never danced with the New York City Ballet, and the ballerina in the intercut video is not her.)