This is a Lightstream Labs feature. For info on enabling Labs features please visit this article
We recommend Snip (download here) as a tool to display what song is currently playing to your stream. Install the program, then right-click on it to select which music player to read from. Then, follow the steps from how to add a text file and select the Folder that you saved Snip in. Lastly, go to your project and add the Snip text file as an layer.