“I make nature videos for my YouTube channel, generally in remote wilderness away from any possible source of music. And I purposely avoid using a soundtrack in my videos because of all the horror stories I hear about Rumblefish filing claims against public domain music. But when uploading my latest video, YouTube informed me that I was using Rumblefish’s copyrighted content, and so ads would be placed on my video, with the proceeds going to said company. This baffled me. I disputed their claim with YouTube’s system — and Rumblefish refuted my dispute, and asserted that: ‘All content owners have reviewed your video and confirmed their claims to some or all of its content: Entity: rumblefish; Content Type: Musical Composition.’ So I asked some questions, and it appears that the birds singing in the background of my video are Rumblefish’s exclusive intellectual property.”
YouTube Identifies Birdsong As Copyrighted Music (Original video, Original forum post).