Though Free users can also join a Jam, they do need to be on the same Wi-Fi.
Users on the same Wi-Fi web link will be prompted to join the Jam when they open Spotify.
The host is then in control of who’s in the jam and also the songs in the queue.
Spotify Jam Makes Real-Time Playlists With Your Friends
The new collaborative feature enables Premium users to host an internet music party.
