In my opinion, I think the music has a huge impact along with the content. They usually are related. I've even noticed some of the lyrics are timed extremely well with images sometimes. Not to mention, it may help get the content found by normies searching for a song. Or maybe it helps with the algorithms too. I'm sure all of the above. If you don't like the music, just mute it fren. But I think you are missing out on some top level creativity and he obviously cannot be working alone.