fixed

gistfile1.m

- (void)playPause:(id)sender {
    player = [MPMusicPlayerController applicationMusicPlayer];
    
    if ([songs count] > 0) {
       
        if (isPlaying) {
    

           NSLog(@"Playing music");
             [player pause];
            [sender setTitle:@"Pause" forState:UIControlStateNormal];
            isPlaying = NO;

        } else{
         
        NSLog(@"Music paused.");
            [player play];
            [sender setTitle:@"Play" forState:UIControlStateNormal];
            isPlaying = YES;
        }
    
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Uh oh!" message:@"You forgot to select some music!" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
        [alert show];
    }
}