Trending helps viewers see what’s happening on YouTube and in the world. Some trends are predictable, like a new song from a popular artist or a new movie trailer. Others are surprising, like a viral video. Detailed info: https://goo.gl/f8xg8y . Hope this helps!
Still, i dont think people want to see just music videos, i have to scroll down loads to actually find something that isnt a song or movie trailer. Something that an actual youtuber created.