Possible Clues:

• Song sung primarily at religious ceremony
• Soul music?
• "Swing Low, Sweet Chariot", e.g.
• Song saint used to introduce religious ceremonies
• Jungle baby from colourless Staffordshire town
• Incorporeal. like Graves's Quixote?
• Southern religious observance
• Version of Virgil from Knox
• Christian Afro-American song
• Song with origins in Southern plantation involving religious activity