Ronaldo Rosok (born in 1998) graduated from the Manado State University as Bachelor Of Music Education with major in Conducting. Since 2018, he has been the Lead Conductor of the CANTORUM and Nesyer Chorale, bringing the Choirs TO Compete in various National and International Competitions. In 2023, he lead CANTORUM to participate in it's first abroad International Competition in Japan (Takarazuka International Chorus Competition). He also served as both Singer and Soloist of various choirs such as North Sulawesi GMIM Male Choir, North Sulawesi Provincial Male Choir, Gema Sangkakala Mixed/Male Choir, UNIMA Student Choir and HARMONY PROJECT in which he is a regular participant in various festivals and competitions abroad for example In France, Italy, Singapore , Australia and Japan. Under the leadership of Ronaldo, CANTORUM have participated two times (2023 and 2024) in Japan (TICC-Hyogo, Japan) and once in Australia (Exelsia ICCC-Sydney,Australia) and yield godd results.