> Singing is strange, you can't really see what other singers or yourself are doing. With the piano you can take a look at your teachers hands, but with singing you have to go on a kinda of exploration into sensations in your body, with the teacher as an experienced guide.

Actually the same is true for playing the piano as well. Piano playing is not as intuitive as people believe because it is not just the apparent vertical movement of fingers hitting the keys. Rather, it actually involves the entire lower arm from the elbow down to the finger tips working together. What you see as a concert pianist’s fingers moving up and down is a lot of the time actually a series of very rapid and infinitesimal wrist rotations and learning these rotations actually require piano students to feel the subtle muscle sensations and movement associated with those movements.