Play music in iPhone application

Play music

    NSError * error;
    
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&error];
    if(error)
        NSLog(@"Failed to set category to the AVAudioSession : %@", [error localizedDescription]);
    
    NSURL * musicURL = [[NSBundle mainBundle] URLForResource:@"music_file_name" withExtension:@"mp3"];
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:&error];
    if(error)
        NSLog(@"Failed to play AVAudioSession : %@", [error localizedDescription]);
    
    [self.player play];