That’s a Widget like the iTunes 11 MiniPlayer, always on your screen even in Apps!
You Can drag it everywhere, and dragging in the right margin of the screen or tapping the Album Artwork the widget is collapsed to not disturb!
This tweak is an extension of PowerMusic MiniPlayer and is discounted for you if you have purchased it. MiniPlayer and PowerMusic give you a great Music experience on your iPhone or iPad.
Experience iTunes 11 MiniPlayer on your iOS device(s). MiniPlayer is accessible from anywhere and any time so interacting with your music while you do other things you love like reading emails or texting friends will be even simpler.
Now you can use one of the most popular iOS applications in a much better and simpler way.
Configure options from Settings app.