App Gallery and My Apps
What's an App?
Although there are many changes when you upgrade to 7.4, the change affecting all players is the new menu structure. All services you've used, such as Pandora, Last.fm, Deezer, or Napster, is now called an App.
All of your Apps are now in App Gallery.
Where's My Service?
All Apps, i.e., Music Services, Internet Radio, Podcasts, and Sounds & Effects have been moved into categories. Here's where they moved to: