Hi.
Vocal removal is quite harder than you think; you have to remove the background music and attenuate all of the drums and even then would you not end up with a perfect result.
There are such things as getting an instrumental, inverting it and aligning it with the original track leaving the vocals.
Central Channel Extraction.
And if you're desperate; taking a bit of the instrumental and using it as a profile for heavy noise reduction but the best option would be to try to get the acapella directly from the creators; though that'll be tough.
Still, good luck.
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