CoverWall is the best way to see, chose and play your music library. It choose 35 album randomly from your device, and display it in a matrix, like the Mac OS screensaver.
-You can list the songs of an album, by taping it with one finger
-You can controll the palying by taping the screen with two finger
-You can close both window by taping out from the window
-You can set the changing intervall from settings app
-You can use it with your iPhone/iPad/iPod