(SOUNDBITE OF ARCHIVED RECORDING) BARACK OBAMA AND UNIDENTIFIED CROWD: (Singing) I once was lost... BALABAN: The history of "Amazing Grace" is already full of remarkable moments. But here's just one ...

So I sang ‘Amazing Grace’ because I knew that everybody ... Oh, and we can’t forget when President Barack Obama sang it in 2015 at a eulogy for one of the victims of the Charleston, S.C ...