Another round of copyright strikes are going out for anything involving the songs listed on the upcoming 15th of July "Pinkie's Party" album. Like most of the recent takedowns, this is most likely an automated system causing trouble and temporary, but if you want to fully protect your Youtube channels, it might be a good idea to remove any of the songs listed in that album.
If this follows the same path as the previous round, it will only last about a week before things get reverted on most (though not all) of fandom-built things. The actual songs themselves will most likely be shot though.
Thanks to RainShadow for the heads up!