Though not often highlighted in literature on music aesthetics, the Saint-Simonians, a group of French Romantic socialists, exerted widespread influence on politics, philosophy and the arts after 1830. Their conception of music as a political-affective tool in the hands of an artistic avant-garde impacted the aesthetics and practice of musique populaire, a category embracing ‘popular’ and ‘folk’ music. Pierre-Jean de Béranger, the most popular writer of chansons in this period, declared his sympathy for the cause of radical social change in song, while his friend the working-class socialist philosopher Pierre Leroux influenced music aesthetics through his alliance with the novelist George Sand (Aurore Dupin). Drawing on Leroux’s writings for its philosophy of history, Sand’s major ‘music novel’, Consuelo, advocated for musique populaire, as its operatic singer heroine finally abandons the stage and becomes a travelling folk musician.