The best thing about MB3: Mixer Box is the ease with which you can create playlists, just by adding songs to them. Whenever you create a new list, it will start playing automatically, showing the corresponding videos only on the upper section of the screen. And even if the screen is turned off, the songs will continue to play.
As expected, MB3: Mixer Box will show you artists trending at the moment, and also search for any specific song or album you might be looking for. It has some interesting functions like the DJ tab, which finds new music for you, and the news tab, which shows everything going on in the music world.
MB3: Mixer Box is a good YouTube client that plays music more easily and effectively than the official app. This app, basically, can serve as a free substitute for Spotify.
Requires Android 3.0 or higher