In March 1977, the Sesame Street Muppets Oscar the Grouch, Ernie, Bert, and Big Bird appeared on one of her TV specials, Numéro 1. Mathieu argued and even arm wrestled with Oscar, was surprised at the size of "canary" Big Bird, and sang a rousing "Tous Les Enfants Chantent Avec Moi" ("All the Children Sing with Me") accompanied by Ernie playing the piano and Bert strumming the guitar. While Big Bird danced with her, even Oscar joined in on singing the song.