The Blue Note is a biographical drama that depicts the last few days of acclaimed composer and pianist Frédéric Chopin.
The film begins with Chopin (played by Janusz Olejniczak) arriving in Paris in 1848 after a three-year absence. He is greeted by his friend and lover, the writer George Sand (played by Marie-France Pisier), who has arranged a concert to celebrate his return. Despite the critical acclaim and success of the concert, Chopin is plagued by health problems and a sense of disillusionment with his musical career.
Over the next few days, Chopin's health deteriorates further, and he struggles to complete his final composition, the Mazurka in F Minor. Sand tries to console him and help him finish the piece, but Chopin's mood swings and erratic behavior only worsen as he spirals into depression and despair.
Meanwhile, tensions rise between Chopin and Sand's children, who disapprove of their mother's relationship with him and feel overshadowed by his presence in their home. Chopin becomes increasingly withdrawn and uncommunicative, and his relationship with Sand begins to break down.
As Chopin's health worsens, Sand calls in a doctor, who diagnoses him with consumption (now known as tuberculosis). Despite his illness, Chopin continues to work on the Mazurka, determined to complete it before he dies.
The film ends with Chopin's death on October 17, 1849, with Sand at his side. The Mazurka in F Minor, completed in the days leading up to his death, is played over the closing credits.