Songs not getting played by setQueueWithItemCollection api - iphone

Question

I am testing the following simple code on my iphone 4 with iOS 5.0 on it. I implemented the following sample code to play a user selected song. The user clicks on the a button on the page, its shows his playlist/songs .... but once the song is selected and picker is dismissed, the song doesnt play. What gives?
From my *.h file
#interface MusicPlayerDemoViewController : UIViewController <MPMediaPickerControllerDelegate> {
MPMusicPlayerController *musicPlayer;
}
#property (nonatomic, retain) MPMusicPlayerController *musicPlayer;
- (IBAction)selectMusic:(id)sender;
from my *.m file
- (IBAction)selectMusic:(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];
[musicPlayer setQueueWithItemCollection:mediaItemCollection];
[musicPlayer play];
}
- (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {
[self dismissModalViewControllerAnimated:YES];
}
SOLUTION:
Add the following code in ViewDidLoad. I wasn't instantiating the player. All works
[self setMusicPlayer: [MPMusicPlayerController applicationMusicPlayer]];
// By default, an application music player takes on the shuffle and repeat modes
// of the built-in iPod app. Here they are both turned off.
[musicPlayer setShuffleMode: MPMusicShuffleModeOff];
[musicPlayer setRepeatMode: MPMusicRepeatModeNone];