I've been singing now for about three years and still have the book with me when I go the the various singarounds in the area. Some songs I do know right through and can do without recourse to the words but others I just haven't been able to keep in my head. I think it is nerves - a good friend of mine, good guitarist and singer, who has been into the music, although not performing, for many years still finds it difficult to work without the music and words in front of him because, being rather shy, he gets very nervous when he performs. If he didn't have that paper he wouldn't play and that would be a real loss.