Sorry for that title in advance :P
I've been watching a lot of Minecraft cover music videos lately, covers of popular music like songs from Adele. They're performing and writing the texts themselves, however, they either have a karaoke playback thingy or they imitate the music. My question, do you need a license for using the music of a song that is copyright protected and how much would that cost?
I do realize that this situation is different from country to country, I'd be interested in the situation in the USA and Germany.
If anyone happens to know more, I'd really appreciate some help :)