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As you’ll recall from Chapter 4 and Chapter 14, a Silverlight program can get access to the phone’s photo library for retrieving photos and saving them, but it needs to use an XNA class named MediaLibrary in the Microsoft.Xna.Framework.Media namespace. You need that same class—and other classes in that namespace—for accessing and playing music
Any program that uses MediaLibrary needs a reference to the Microsoft.Xna.Framework DLL; The MusicByComposer program also needs a reference to Microsoft.Phone.Controls for the Pivot control.