By the way,

To state the obvious,

It would be useful to keep in mind one key fact:
whether it be a sheaf of papers or a floppy disk, a songbook fulfills a perceived need on the part of the person who uses it. You might not have that need, but that doesn't make the need any less real to that person. Yes, a songbook is a crutch, but in the real world people need crutches (and wheelchairs, and portable respirators).

My favorite response to my laptop:
I have a friend who is a great musician and knows a million songs from memory. The first time I ever took my laptop to a party at his house, he looked at me quizzically as I set it up. "What's that for?" he asked. I explained. I could see him switch to his lecturer mode. "There are," he began, "lots of things one can do to deal with such memory issues." But then he paused, looked very thoughtful, and finally said, "but that's exactly what you are doing, isn't it." And that was the end of the matter.