Answer
Sơn Tùng M-TP was 18 years old when his first single, "Cơn mưa ngang qua" (A Passing Rain), was released in 2012. The song was a huge hit in Vietnam, and helped to launch M-TP's career as a singer and songwriter. He has since released several other successful singles and albums, and has become one of the most popular artists in Vietnam.