Seth’s scores have become one of the most recognizable voices in Vietnamese horror, from the ghostly horror of Chung Cu Ma (Conjuring Spirit), to the historical horror of Thất Sơn Tâm Linh (Kumanthong) and the survival horror of TaNang PhanDung (SURVIVE). Seth's horror music approach uses vast layers of orchestral effects and sound design to immerse the listener in a frightening alternate reality.

Besides being atmospheric and thrilling, his horror scores always strive to connect with the characters in ways that horror films seldom achieve, through the use of nontraditional instruments, carefully selected and tailored to the time and place in which each movie occurs, and themes that follow the inner desperation, struggles and triumphs of the characters.