, <MediaPlayer/MediaPlayer.h> framework [MPMediaLibary defaultMediaLibrary] MPMediaLibraryDidChangeNotification, , - , iTunes.
, :
#import <MediaPlayer/MediaPlayer.h>
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(<#selector#>:) name:MPMediaLibraryDidChangeNotification object:[MPMediaLibrary defaultMediaLibrary]];
, - (void)beginGeneratingLibraryChangeNotifications