With each concert we perform, our director has us memorize more of our music. Now we are up to 4 pieces, and it is really difficult for me to remember the lyrics. The "repeating it over and over method" doesn't really work. I think I have had the best luck with posting the lyrics on my bathroom mirror, and I can't leave the room without going through them at least once. Even then it takes a long time. What works for you?