SpMp is a Youtube Music client that was released recently, yet it's incredible. Although it has some features I dislike such as showing what's popular by default, the app has what I can only describe as a next generation UI. Where lyrics are placed, the typeface in use, animations, menus, colors all tie the app together to create a unique experience. It's not quite ready for daily use due to bugs here and there but I had to mention it because I see so much potential in it.