Magic Playlist - Get the playlist of your dreams based on a song
Oto Music - Oto Music is an Android music player app that features Chromecast support, an equalizer, a ton of music controls, and functionalities.
Spotalike - Spotify playlist with similar songs, according to Last.fm
Poweramp - Music Player for Android
Playlist Machinery - Tools that help you create & organize your Spotify playlists
3D Surround Music Player - 3D Surround Music Player allows you to listen to music with exceptional sound clarity and exclusive features such as dynamic bass boost, virtual3d surround effects, and treble boost.