Themes of death, childhood, and love frequently feature in her songs, characterized by her crystalline, often delicate opera voice and the baroque (and occasionally electronic) musical arrangements.
She also lent her delicate voice to several tracks on Jean-François Coen's inaugural album, notably 'La Tour de Pise,' for which Michel Gondry once again directed the music video.
This album marked a significant shift in her musical style, incorporating ancient baroque instruments harmoniously blended with electronic loops and contemporary choreographic structures.
This album showcased a distinct shift in style, embracing a more electronic sound and symbolizing Robert's transformation from a princess-like persona into an artistic representation resembling a witch or siren.
Notably, Amélie Nothomb contributed lyrics to six of the songs in 'Celle qui tue' and also authored The Book of Proper Names' a romantically embellished biography of Robert.
A specific song from Robert's prior studio album, 'Le Prince bleu,' captured the attention of American actress Majandra Delfino, who expressed a desire to collaborate with the artist.
In November 2005, Robert embarked on the recording of her fourth album, 'Six pieds sous terre,' which introduced a more pronounced presence of acoustic instrumentation, including the (harpsichord, clarinet, harp, violins, and flute.
Comprising eleven songs penned by Robert herself, the album also featured a cover of Marie Laforêt's 'Prière pour aller au paradis' and a duet titled 'Histoire du loup' with actor Sacha Bourdo.
A year later, in late 2008, she recorded her new studio album titled 'Sourde et aveugle,' once again collaborating with her husband Mathieu Saladin, and also with Austyn, a young French blues musician with whom she sang 'Le jardin des roses.'