Now you can listen to music with your friend while chatting on
Facebook. This
music on Facebook feature enables you to listen music which your friend is listening on the other side while on the chat. Now, you can listen to music with your friends when you're alone, like at work, at home or anywhere.
So how this works, this feature allows you to listen exactly the same music at the same time which your friend is listening currently. Before you start listening to music with friends on Facebook, you'll need to allow the music app which you and your friend use. Currently there are only two apps available,
Spotify and
Rdio, which may also be considered as one of its limitations.
Now, after both of you have installed the app you'll see this
sign to the name of your friend in the chat sidebar when he is listening the music. Hover over the name of your friend, and click the
Listen With button.

The music will start through the service your friend is using. You'll also have the option to join others in a group chat.