The trend for people to bring looseleaf binders with a hundred or more songs that they can't sing seems to be growing. If a song is worth singing, its worth learning, in my opinion. However, we do have a chap who is a very accomplished singer, one of the best we have actually. He cannot perform without his songbook in front of him - its a battered old A4 hardback with songs he has collected over the past 30 odd years in it. He never reads from it, or uses it for much more than deciding which song he is going to treat us to, but without it he would be lost.