Play for aging audiences who have also forgotten the words. It's ok to bury Johnny before Frankie shoots him. He is doomed anyway. Frankie can dispose of the murder weapon by flying to Chicago and pawning it after the crime. She'll never see the Warden and his 'lectric chair unless she hires the wrong lawyer or lives in Texas. Stay after class and write the correct lyrics 100 times on a blackboard then take an aspirin for the pain. Don't worry until you fail to realize you've got all the verses out of order. After that, what you don't know you can't remember won't hurt you. Bad memory is an important facet of the folk process. Don't ever apologize for it.