According to Wikipedia: "The Imaginary Invalid (French: Le malade imaginaire) is a 1673 three-act comédie-ballet by the French playwright Molière with dance sequences and musical interludes by Marc-Antoine Charpentier. It was originally choreographed by Pierre Beauchamp. Molière had fallen out with the powerful court composer Jean-Baptiste Lully, with whom he had pioneered the comédie-ballet form a decade earlier, and had opted for the collaboration with Charpentier, Lully's rival and arguably a more gifted composer. Le malade imaginaire would turn out to be his last work. He collapsed during his fourth performance as Argan on 17 February and died soon after. Beyond the obvious irony, given the play's title, it is possible that Molière was poisoned by Lully, or at the jilted collaborator's instigation."