It was the most wonderful performing experience of my life. There I sat on a swing suspended some twenty feet in the air over my audience singing a song that I first sang as a teenager in a high school production of "Roar of the Greasepaint, Smell of the Crowd." "Feeling Good" is such a simple song but thanks to Nina Simone's arrangement, it has plenty of room for drama and dynamics. And then there was the Full Moon in the night's sky shining down on me, …