He used nothing of the original (aside from lyrics), therefore it is fair use. For something to be fair use it has to be transformative from the original work. In the end, Roomie is in the right, and Billie's publisher is actually doing something illegal.
I'm happy to have a discussion, but @mkate_ultra blocked me, so...
Not sure why what I said could trigger someone, but 
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Oh, really? Well... I can see this from both sides. They are doing something, and laws could be an issue, but also YouTube has stayed mostly silent on how they're trying to please both sides. That's one thing YouTube really lacks, communication with consumers.
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Here we go, YouTube's finally taking action
:https://twitter.com/TeamYouTube/status/1162064808830627840?s=19 … - 1 more reply
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, it's the big music companies abusing the broken copyright system. If YouTube were to make a proper, working system, the companies would lose out on huge profits and would either sue them into the ground or pull out of advertising.
New today
A policy preventing Copyright owners from making $ on manual claims for:
Short song clips (ex: 5 sec of a song)
from passing cars)
Claimants can still block monetization or the video itself, but timestamps help you edit out the claim.