"Sony Mobile has pushed an update to the WALKMAN application for Xperia devices that moves the build number from 8.3.A.0.7 to 8.4.A.1.4. The 11.4MB update now allows you to get detailed views on your music. A small arrow sits below each track now which brings up a menu allowing you to open the song, add it to a playlist, share it, set it as a ringtone or see the Artist.
The sliding navigation menu has also been changed to feature new icons for the menu items. A new menu item called “My Library” replaces the “Artists“, “Albums” and “Songs” menu items from the previous version. When clicking into My Library you can see all of your music divided by the above three headers. Sony now also allows you to go to Artist and Album from any music item."
Font: Xperia Blog.