A humanist, known for his great erudition, he entered as a music critic for the newspaper Le Monde, the Figaro littéraire and the magazine Carrefour.
A lecturer by the Jeunesses musicales de France, he participated in numerous programs at the ORTF and worked for various German radio stations.
He gave a series of radio lectures under the title "Éphémérides de la musique contemporaine".
In 1958, he organized concerts of contemporary music at the Théâtre national populaire under the name "Musique d’aujourd’hui".
In addition, Claude Rostand participated in several collective publications: Every year, the professional syndicate of theater, music and dance critics presents its Grands Prix, which distinguishes the shows and artistic personalities that marked the season.