Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.
AIMP - AIMP : Free Audio Player : Официальный сайт программы
Palco MP3 - Palco MP3 is the largest Brazilian application for independent artists and offers more than 1 million songs for you to listen and download on your mobile device.
Samsung Music - Samsung Music app supports playback of almost all audio formats so you can effectively enjoy songs from your phone’s storage.
Audiomack - The free SoundCloud alternative
Poweramp - Music Player for Android