Paul Simon has revealed that he has hearing loss that affects his performing.
this loss affects not only the ability to hear himself in the ensemble but to hear musical pitches accurately.
As a (VERY amateur) musician, I empathize with him because I have the same problem. It does not affect my career–I am a retired engineer. However, it does hinder my participation in an important social connection.
I wanted to tag this to the musician’s group, but I don’t know how.