The idea of listening music at the same time through a smartphone without being in the same place. Like doing FaceTime but instead with music.
It will probably be an app on your phone that can synchronize what everyone is listening in a specific channel. It is like becoming your own radio station.
"Spotify launched just over a year ago in the United States (July 14, 2011) and during that time has garnered more than three million U.S. users, with roughly 20% of them paying subscribers." by Hisham Dahud