One problem I used to have was that even though I knew every verse of a song inside out, sometimes when I got to the end of a verse, I would forget the first line of the next verse. So now when I practise a song, I always make sure I practise going from one verse to the next - so that it comes as naturally as the next line in a verse.I didn't mean to sound snobbish about not having the words in front of me. Its just that I've found I don't sing as well if I'm reading the words. In singarounds I often use prompt sheets to remind me of bits where I might come unstuck - but I don't like doing that when I'm standing in front of an audience as it puts me off.
Bagpuss