Hank Williams: "House of Gold"
Pandit Jasraj: "Shivastakam" (This singer is, well, awesome. Although this rather uncharacteristically poppy song certainly isn't him at his best, I don't have time now to dig through everything on Youtube to find something better.)
The Swan Silvertones: "Saviour Pass Me Not"
"I'll Fly Away"
Monteverdi: "Ave Maris Stella" (best "amen" ever)