Facebook is taking another huge step forward by adding a "Listen" button for instant artist access. In other words, performer pages will begin adding auto-integration with music-apps so you can listen to music instantly on an artist page. With the popularity of Facebook on a downswing due to the "Timeline" format of the page, this will certainly be a positive move especially for singers and songwriters, bands and so-forth. The feature is showing up on musicians pages so you can immediately listen to their songs. It integrates with Spotify, MOG, or any one of the other popular and Open Graph approved apps. So before you can "hear" anything, you are going to have to add one of those apps.
The Listen button for band and artist pages isn’t available via smartphone or tablet.
And.. by the way, if you don't like the Facebook Timeline look, go here to learn how to get rid of it.