I just want to share this information with you, apparently you now can use music of some artists (eg Justin Bieber) and apparently there wouldn't be problems, that if, some videos can be monetized and others no.
The picture says : "If you use this song : Playing - It can be seen everywhere, except in Germany.
Advertising - Ads may appear.
If you create a version : Playing - It can be seen everywhere.
Advertising - Ads may appear."