Although I appreciate the song choice, I think that scream was unnecessary since...well...vocaloids don't produce the best screams, at least in my personal opinion.
Eh, depends on what you think is good. TBH if you listen to certain Rock/Metal Miku songs the screams are quite good.
Personally them using the Vocaloid is a good idea, but for the sake of image (and fitting more into standard American advertising) should have used Megurine Luka instead. Props to anyone who gets what I'm implying
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