Marie d'Agoult (1805-1876) was a French writer and intellectual, best known for her close relationship with composer Franz Liszt. Though not a composer herself, she significantly influenced the music scene of her time through her writings and social connections. D'Agoult was a prominent figure in the Romantic movement and wrote extensively about music, culture, and society. Her notable works include "Nécessité et Idéal" and "Histoire de la musique," where she explored themes of artistic expression and the role of music in society. She also published essays and articles that promoted contemporary composers, including her partner Liszt. Her impact on music is largely attributed to her role as a muse and collaborator, helping to shape Liszt's musical career and promoting the ideas of the Romantic movement in her literary works. D'Agoult’s salons were vital for fostering artistic discourse in Paris, providing a platform for many musicians and writers of her time. In summary, while Marie d'Agoult was not a composer, her intellectual contributions and support of prominent musicians left a lasting imprint on the Romantic music landscape.