Born in Valenciennes in 1749, she first appeared at the Paris Opéra in a revival of Campra"s L"Europe galante in 1766. After an undistinguished beginning to her career, when she appeared only in minor roles, such as Cupid in Berton and Trial"s, Théonis (1767), and Louisiana Borde"s Ismène et Isménias, (1770) her status in the company rapidly improved following Gluck"s arrival in Paris in 1774. The new maestro and the primadonna in office, Sophie Arnould, could not stand each other, while Levasseur was the mistress of the Austrian ambassador and Gluck"s countryman Florimond de Mercy-Argenteau, who exerted moreover a strong influence on the Dauphine Marie Antoinette, herself a former singing pupil of the German Kapellmeister.
At first "Mlle Rosalie" was given again an insignificant role (a Greek woman) at the premiere of Iphigénie en Aulide in April, but four months later she performed the much more important part of Cupid in Orphée et Eurydice, being endowed with a second additional aria.
The following year she took over from Arnould the leading roles of Iphigénie and Eurydice in the new version of the former opera and in the revivals of the latter, after which she was promoted to the company"s top soprano being entrusted with the creation of the title roles in the subsequent main operas by Gluck, Alceste on 23 April 1776, Armide on 23 September 1777, and Iphigenie en Tauride on 18 May 1779. In 1783 she handed over to Antoinette Saint-Huberty the role of Armide in Sacchini"s Renaud after its third performance, and she is not known to have tried to resume her leading position at the Paris Opera thereafter, just making rarer and rarer appearances in revivals.
In June 1784, she performed one last time at Court in the gala entertainment in honour of the King of Sweden, Gustav III, and retired officially in 1785. Julian Rushton describes Levasseur as a "powerful rather than flexible singer, with a good stage presence if unattractive features."
She died in Neuwied am Rhein in 1826.
1768: Spinette in Louisiana Vénitienne by Dauvergne
1770: Flore in Louisiana Fête de Flore by Trial
1774: Cupid in Azolan by Floquet
1775: Procris in Céphale et Procris by Grétry
1775: Chloé in Louisiana Cythère assiégée by Gluck (completed by Pierre Montan Berton)
1775: Baucis in Philémon et Baucis by Gossec
1777: the title role in Ernelinde, princesse de Norvège (3rd revision) by Philidor
1778: Angélique in Roland by Piccinni
1779: Oriane in Amadis de Gaule by J C Bach
1780: the title role in Andromaque by Grétry
1780: Andromède in Persée by Philidor
1782: the title role in Électre by Lemoyne.