Possible Clues:

• After a century the county sang them
• Protesters' cries
• How the Hampshire Hundred become vocal
• Sounds as if this gives one the opportunity for singing
• Sings in one tone
• Sounds like the luck of the draw that makes them sound so musical
• Demonstration noise
• Sings in monotone as in psalm
• Sings a monotonous song or intones prayers
• Bleacher outbursts, sometimes