I am producing educational animation for kindergarten kids and I am making educational games based on the animation series. If I upload an episode on YouTube, is practically impossible to change the audio, if there is a copyright strike, thus, the video will go down. So I contact any creator that I am interested to use his work, if I find his work in a 3rd party site, to be 100% sure. This particular case was for an episode about time of the day and healthy diet. The scene was about some vegetable characters dancing samba. That particular artist has the only samba tune with creative commons license that I managed to find, so I contacted him, he asked money, I politely told him that I will explore more options. Finally I found a funny song, not samba,
but fitted better for my scene...
As I said the emails are available via PM to anyone that might be interested...