Tania Kassis started her first singing lessons at the age of 16, and gave her first solo opera concert at 17. The next year, she interpreted Cosette in the Musical « Les Misérables » at the UNESCO Palace in Beirut.
In July 2001, she is chosen to represent Lebanon in the Fourth Francophone Games (les IVème Jeux de la Francophonie) in Ottawa-Hull (Canada), where the local press said: "cette sirène du pays des cèdres qui a embrasé son public qui lui a réservé une ovation debout" (Journal Le Droit).
This participation had such a success that she was granted the Medal of the town of Ottawa-Hull, the Lebanese Achievement Medaland anExcellency Certificat by « The Canadian Lebanese Professional and Business Association of Ottawa ».
In 2003, she enters the Paris Conservatory in the class of Mr Pierre Catala, qualified by the Julliard School of New York. During this period, she discovers the Musicals and she gives a concert « Special Musicals » at the conservatory and then at the Estivals of Deir el Qamar (Lebanon).
In October 2006, she becomes a member and soloist of the Choir of the Paris Orchestra (le Chœur de l'Orchestre de Paris) and participate regulartly to it's concerts at the prestigious Salle Pleyel.