There have been a few discussions about copyright claims made against users of stock music, but I ran into one a bit different.

I created a song for a video using an Arpeggiator on a soft synth and some drum samples. It got a copyright claim for a Kid Rock song called 3 Catt Boogie (which I had never heard). I listened to the claimed song and it only had two similarities. It was in the same key and used the same chord pattern. His song had guitars, lyrics, and other instrumentation that did not exist in mine. I disputed the claim and it was released within a day, but I find it odd that two songs so completely different in sound, instruments, etc would be found to be the same song in the youtube algorithm. It makes me think the software has been tweaked to catch cover versions of songs as well. If you want to hear the songs, I will post links. (mine was not a cover version either since I had never heard his song)