Possible Clues:

• With a pen one might have an inclination for song
• Protestors' shout
• Type of singing with a simple melody and several words sung on one note
• Monk's monotone
• '2, 4, 6, 8 — who do we appreciate?,' e.g.
• (Gregorian?) song
• Monk music
• It can be monotonous
• Intone — recite
• Idle talk about end of siren song