As a harpsicordist she was a pioneer of historically informed performance, co-founding the first French Baroque ensemble with early instruments.

[2] Bailleux was the substitute for Antoine Reboulot [fr] at the grand organ of the Abbaye de Saint-Germain-des-Prés from 1966[1] where she became organiste titulaire, along with André Isoir, in 1973 and held the post for a long time.

[4] As a harpsichordist she played continuo in the group Musique-Ensemble that she and oboist Michel Henry founded in 1975 as the first French Baroque ensemble with early instruments.

[1][2][4] Bailleux made only a few recordings as a soloist, French Baroque music and also Froberger and tientos by Correa de Arauxo.

Her recording of Nicolas de Grigny's Premier livre d'orgue at the Moucherel/Formentelli organ of the Albi Cathedral in October 1983 was reissued in 2009 and was awarded a Diapason d'Or then.