Find Song From Persistent ID

	MPMediaItem *song;
	MPMediaPropertyPredicate *predicate;
	MPMediaQuery *songQuery;

	predicate = [MPMediaPropertyPredicate predicateWithValue: MyPersistentIdString forProperty:MPMediaItemPropertyPersistentID];
	songQuery = [[MPMediaQuery alloc] init]; 
	[songQuery addFilterPredicate: predicate]; 
	if (songQuery.items.count > 0)
	{
		//song exists  
		song = [songQuery.items objectAtIndex:0];
		CellDetailLabel = [CellDetailLabel stringByAppendingString:[song valueForProperty: MPMediaItemPropertyTitle]];			
	}