Duet for One (1986)
Duet for One (1986) is a film adapted from an award-winning British play, a two-hander by Tom Kempinski, about a world-famous concert violinist named Stephanie Anderson who is suddenly struck with multiple sclerosis. It is set in London and directed by Andrei Konchalovsky. The story is based on the life of cellist Jacqueline du Pré, who was diagnosed with MS, and her husband, conductor Daniel Barenboim, and only marginally fictionalized.
More at Wikipedia.