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Okay, just to make sure, you are asking for one song for all of those animes together and not four songs (one for each anime) right?
Because if you're making a mixed amv I understand how Akira, Hellsing, and Kara no Kyoukai can fit together, but I don't have any idea how you're gonna make Spirited Away fit in the same video
Or has it just been too long since I've seen it? I don't remember it being anything like the others though.
Somebody correct me if I'm wrong, but I think you'd be better off looking for a song to go with just the other three.