His first appearance was in "Studio El Fan" where he got the first prize in "The Lebanese Song" category.
Ghassan's singing career began when he took part in "Petra" (1977), the popular musical play of Rahbani brothers.
In 1988, he starred in "Sayf 840", a musical play for Mansour Rahbani, where he played the role of "Seif El Bahr". Ghassan proved in that play to be the best to sing patriotic songs. Some of the patriotic songs of the play were "Lama3it Abwa' Essawra", "Zayyinou Essa7a", "Tawwalou Aleina", etc.
Also, the warmth of his voice was clear in "Gharibayn Wu Layl" which is one of the most famous Lebanese love songs ever.
In summary and till now, Ghassan Saliba has acted in 13 musical plays.