The primary and most important quality a singer or rapper must possess is the ability to be able to remember, sing and recite lyrics. You might not be able to write them, but at least you shouldn't forget them. Most artists get to forget their lyrics at some point, which is quite unfortunate. The reason and factors may vary. They range from fear, stress, less preparation, and so on. You never know when your time is up. It's unanticipated and spontaneous. Newer artists are more likely to forget their lyrics, but it's not a big problem, because people get better with time and experience. There are some habits and routines used by many artists and college students to make them easily remember their lyrics and study materials.