Les, do you have any planned way of getting people to stop depending on the book?

Nigel doesn't, and it's the one glaring weakness in his project. There are quite a few players who have got very much better at playing the tunes over the years - often better and with more idiomatic feel than average ear players do - but with absolutely no sign that they'll ever learn even the simplest ones. I'd be tempted to find out how to sabotage the fusebox, except Nigel has started selling LED score lights.