I am an infrequent poster of YouTube videos and recently I posted
a video of our new creation, the Star of Bethlehem, an animated and
programmed LED light display.  The background music is "O Holy Night"
and is a MIDI file I arranged and played for use on my MIDI-controlled
fairground organ back when I was arranging in the 1990s.

Within a day YouTube notified me of a "content ID claim" and asked
did I want to dispute the claim, which I did since "O Holy Night" was
composed in the middle of the 1800s and I arranged and played the music
myself.

To insure that the video would be viewed, I uploaded another one
without the music but I did not remove the one with the music.
Then, the next day, I received a notice of cancellation of the claim
because the claimant did not respond to my dispute in 30 days!
It was only a day after the claim was sent to me -- what nonsense!
Now I have two videos of the Star of Bethlehem.

  https://www.youtube.com/watch?v=IhQYnkeM9Xc 

Thanks, Matthew, for bringing up this topic.

Andy LaTorre