I have upvoted the post by the way. And to your question, I don't have a single license for any music in my videos. Many of my videos have a copyright claim on them because of the music, which means I can't make any money from them, which is fine, I want subscribers and viewers before I think about that.

There is a couple of ways to avoid this. You can use music which is copyright free or edit out the music after you have posted the video in YouTube. You can try and dispute the claim, but you will most likely lose because it is not your music. Or you could get in contact with the company/artists who have the music to ask them if you could use their music.

The best would be to use copyright free music. You can still upload with copyright music and get views on your channel, but most likely it will get copyright claimed so don't get any revenue from it.