While doing the vocal exercises on volume 1, my dad told me I was off pitch. I was wearing headphones and told him he couldn't tell which pitch I was in as only I could hear it. He's been singing for over 40 years and his voice isn't that great either which makes me irritated when he critiques me. However, because of the headphones ( they cover my ears completely, not earbuds) I've noticed I have to somewhat pull the headphones off just a bit so I can hear myself. Does Ken teach pitch or is it learned as you go along? I've played piano and guitar so I'm well aware where pitch is. Thank you.