One of the marvellous things about John Bonham which made things very easy a producer was the fact that he really knew how to tune his drums, and I tell you what, that was pretty rare in drummers in those days. He really knew how to make the instrument sing, and because of that, he could just get so much volume out of it by just playing with his wrists. It was just an astonishing technique that was sort of pretty holistic if you know what I mean.