First, make sure you have set up Google Analytics properly.
In the left sidebar, click Realtime > Events
In the table, the "Event Category" is "inPlayHeartBeat". Click this text. Now you are viewing only events of this category:
As you can see, the "Event Label" shows the email of the logged-in listener, while the "Event Action" shows the name of the particular track to which they're listening.
Hover your mouse over the Event Label to see more info.
Related:
