Ave Maria. To me, this is one of the most beautiful songs ever written, and this is the rendition of it that made me a fan, unbeliever that I am.
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Jessye Norman is an operatic singer based in London, last I heard, but she was born in Augusta, Georgia, where I lived as a child.
(Another famous Augustan: Hulk Hogan. It's not really a great town for the arts.)
I've read that Franz Schubert was a bit of a doubter himself, if not an outright atheist, when he wrote this tune. I love that he was able to find the emotion in religious belief, even while not feeling it himself. Being able to empathize with the emotions of people who may not even be like you is, I think, the kernel of what great art is about.