"Every Note Played" is a novel by Lisa Genova that explores the life of a concert pianist named Richard Evans, who is diagnosed with ALS (Amyotrophic Lateral Sclerosis). The story delves into his struggles with the disease, which gradually robs him of his ability to play the piano and affects his relationships with family and friends. The narrative also focuses on Karina, Richard's ex-wife, who must confront her own feelings of love and resentment as she becomes his caregiver. Through their journey, the novel highlights themes of loss, redemption, and the enduring power of music in the face of adversity.