Castlevania III - The Dracula’s Curse (Akumaj Densetsu) (J) (Nintendo) story and bosses

Story and bosses Japanese version with VRC6 coprocessor chip. This chip added two extra pulse-wave channels and a saw-wave channel to the system’s initial set of five sound channels. The majority of the music combines the channels to imitate the sound of a synthesized string section. (wiki)