She made her professional debut at the Opéra-Comique on 16 November 1933, as la Plieuse in Louise, following this with Loys in Juif polonais by Camille Erlanger, the neighbour in Angélique by Jacques Ibert and small roles in Lakmé (Miss Rose) and Mireille (Andreloun).

By 1935 her performances gained her invitations to Marseille (Lakmé), and then (at the instigation of Pierre Monteux) to Amsterdam (Mélisande) and San Francisco.

At these venues she sang nearly all the great French soprano roles: including Marguerite, Juliette in the Gounod opera, Massenet's Manon, and Mélisande in Pelléas.

On the lighter side, in 1958 Micheau recorded an LP with Paul Bonneau conducting the Chœurs Raymond Saint-Paul and orchestra, including "Fascination", "Oh!

La troublante volupté" from La Reine s'amuse (1912) by Charles Cuvillier, Les chemins de l'amour, Les cent vierges (Charles Lecocq), "Moulin rouge", Valse des souvenirs by Wal-Berg, and Messager's "Si j'avais vos ailes", among others.