Those flat notes by Zac Brown were very noticeable. I was standing next to someone who had just said she liked his voice, and we both winced. Grace is always on key, one of the things I love about her. We don't see perfection very often in this world. 

Later I saw this on Twitter:  

@sakennerjr Scott Kenner
@gracepotter has been one of best vocalists in the biz for many years. I feel sorry for those who have been missing out. #CMAs #nocturnals