Youtube has it's own system outside of the DMCA to handle copyright claims in which the claimant has all the power. If the poster of a video wants to appeal a copyright claim, they appeal directly to the claimant who gets to decide. You can then appeal to YT directly (good luck with that) but in the meantime the claimant can issue a "strike" on your account. 3 strikes and you are out. So instead of fighting claims, p…
Greensleeves was written sometime in the 16th century. That a company set themselves up an automated tool to search for people playing this song tells me that they are either idiots, or greedily trying to steal revenue from YouTubers.