Your problem is, you can read music. Believe me, ignorance is bliss. When I opened this thread, I thought it would be something very different. I've sung in groups and choruses where wonderful singers who have been singing most of their lives can't tell when they are supposed to come in on a line and jump the gun. Even on very simple, three chord songs. It's hard to see, because they are such fine singers. If anyone has any ideas on how to help singers with that problem, I am all ears. If you don't read music, you have to be all ears.

Sorry I'm no help here.
Jerry