Castlevania III - The Dracula’s Curse (Akumajō 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)