Possible Clues:

• Part 3 of the question
• Gregorian __
• Repeated shout in a stadium
• Monk's song
• Sound from a monastery, maybe
• Medieval rap
• 'Na na na, hey hey hey,' e.g.
• Monk's monotone
• '2, 4, 6, 8 — who do we appreciate?,' e.g.
• (Gregorian?) song