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I think it would be fine either way, as there's enough variation in the beat to make it listenable without vocals in this particular case.
I don't necessarily have a problem with it if the song is really good, but I'm often left wondering:
(a) Were there production limitations?
(b) Did they not have a chance to record more material with the vocalist, thinking that the first recordings would be sufficient? Yet, when they went to put everything together, maybe it would only work a certain way from what they originally intended.
(c) Are they just being lazy by being so bloody repetitive?
How about this one? I think it wouldnt sound as good w/o vocals.
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