Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.
Openwhyd - Collect and Share the tracks you love.
Lark Player - Lark Player – YouTube Music & Free MP3 Top Player is a fine tool developed by Mobiuspace Tech Top Player.
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.
Audiomack - The free SoundCloud alternative
FoxTube - Play YouTube video continuously with playlists. FoxTube features: