all: ♪ my grateful heart kirner: i came close to death. large, and it was a pretty scary time. i came out of that surgery blind and unable to walk, and i had an opportunity to decide, "okay, what am i gonna do now? you know, if i get better, i'm gonna do something -- something important." i always loved to sing, and i heard there were these people that sang to people who were dying. and i thought that was the most incredible thing i'd ever heard. i got a little -- a little shiver up my spine, and i went, "oh, i've got to go do this." munger: when they hear that first sound, especially when they hear the harmonies... ♪ ...it's a visceral experience. it's full-body absorption of vibration. cadbury: would you like some more songs, or is that enough? you can see that they begin to breathe more easily, and it's just a feeling that they are relaxed and comfortable. and when they are feeling that way, you feel better, and it's just a reciprocal energy that goes back and forth. sager: i believe that our purpose as human beings is to be givers. how