It is all about stagecraft. I use an electronic cheat sheet which replaced a MusicPad Pro which replaced a 3 ring binder. I don't sing from it, it sits to the side where I can glance at it for key,chord structure, and word cues. As Bill D. has often said, for him it is whether or not he can close his eyes and tell if the performer is singing from it. I was with Judy Collins when she performed at Dogwood, and she had a music stand. For me, whether with my band or solo, the songs in the set list are constantly changing. Each has been thoroughly rehearsed until it is performance ready. But there are far too many for me not to be able to look over for reminders. It is not a song circle at a weekend gathering for me where folks are willing to wait while I stumble around for a lyric. For me it is a crowd of 50 to a 1000 folks that I owe a good performance to. Because I don't do the same songs over and over as some of my friends who have fixed sets, the crib sheets are necessary for a solid performance.