@interface MusicPlayerDemoViewController : UIViewController <MPMediaPickerControllerDelegate> {
...
}
...
// This action should open the media picker
- (IBAction)openMediaPicker:(id)sender;
@end

// MusicPlayerDemoViewController.m
- (IBAction)openMediaPicker:(id)sender {
    MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic];
    mediaPicker.delegate = self;
    mediaPicker.allowsPickingMultipleItems = NO; // this is the default
    [self presentModalViewController:mediaPicker animated:YES];
    [mediaPicker release];
}

// Media picker delegate methods
- (void)mediaPicker: (MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {
  // We need to dismiss the picker
  [self dismissModalViewControllerAnimated:YES];

}

- (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {
    // User did not select anything
    // We need to dismiss the picker
    [self dismissModalViewControllerAnimated:YES];
}