Vivaldimort writes "I uploaded 3 new videos to my youtube channel (same nick as here) a few days ago, and suddenly all went dark... each one of my videos, including one uploaded 18 months ago, have been tagged as copyright violations by some music industry group. Problem is, they're all my own private recordings, my own performance, of pieces published in the 16-18th centuries with their composers presumed dead. Two videos used the original sheet music from said centuries as content. Once I dispute the claim it took between 3 minutes (!) and about a day for the claims to drop, only to be replaced by further claims by other groups the following day. Why can't Youtube mark a video as presumably copyright violation free and prevent this from happening?"