Regarded arguably the greatest Gen Y singer Sri Lanka has produced, Kasun's singing voice has garnered acclaim from prominent musical peers and publications.

[5] Kasun's music career started along with Indrachapa Liyanage and his schoolmates from Ananda College under the mentorship of Maestro K. M. Rathnapala in late 1999.

His mother who was highly supportive of his musical career once answered a newspaper interviewer who asked "what is the most memorable day in your life?"

with "the day Maestro Premasiri Khemadasa hugged and wished my son, following his first musical concert (Waves of Introspection).

[citation needed] He was one of the judges of The Voice Sri Lanka seasons 1 and 2 along-with Bathiya and Santhush, Sashika Nisansala and Umaria Sinhawansa.