I got a copyright notice (not takedown) for a SuperTuxKart video I did years ago.
This one: https://www.youtube.com/watch?v=OB8B8ZxufEs
The song is "One Million Dollar Theme" by the Dead Rocks. It is CC-BY-SA
And yes, I did not mention the song name and its licence. Well, I did not know of either at that time.
I just wanted to share this information. The song is, as far as I can see, not part of STK anymore, but another Dead Rocks song is. So if you use a song by the Dead Rocks in one of your Youtube videos, you might get a copyright notice (even though it's a copyleft licence) and you might have to play commercials for that. Don't know what that means for the STK project though.