1. Rocket Player
By far the best I have used, it even allows you to set any audio or mp3 as Ringtone easily. https://play.google.com/store/apps/details?id=com.jrtstudio.AnotherMusicPlayer Rocket Music Player was designed with both the easy and advanced listener in mind. The easy to use interface allows you to browse to the music you want to hear faster without getting bogged down in details and extra buttons. Additionally, advanced options give you an opportunity to create your own music listening experience with quick playlist editing and a dynamic equalizer.
2. doubleTwist Music Player