Cant remember a cartoon?

It is a very old cartoon. Tv series. About a villain in full long clothes, coat and a mask. Nobody knew who he is and there was a detective girl searching for him. He kinda was obsessed with her. He had a music doll on his table and there was always a rolling doll with a music scene at the end of each serie. Whole series were in a dark atmosphere and in black

Help me remember please

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