Partyhero - Pass your friends the aux!
Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.
Heartbeat - Listen to music with your friends together, on Spotify
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.
TuneMeet - Chat with people who are listening to the same song
Audiomack - The free SoundCloud alternative