Since I went laptop (3-4 years) I started saving singers song slips. Now I don't save every different singers slips, but most of them.
I have 3 old disc books full of slips for different singers. 2 are 150 slots and one is 200 or 250 slots. They are almost full. That's almost 500 different singers coming to my jobs. That I save their slips. Now some I haven't seen because I switched jobs. Some are not regulars anymore, but I'm pretty surprised by that number. That's still not counting the singers slips I don't save.