In any city, in any country, go to any concert hall you can get yourself to. When you reach the front desk, ask to see someone who calls herself "The Holder of Harmony." The receptionist should start to hum a tune you don't recognize and rummage through some papers in her desk. Be patient. Don't ask again, or the receptionist will get annoyed and close the front desk. If this happens, you have forever lost the opportunity to gain the Object the Holder possesses, and that's not even taking into consideration the sentinel beast you've awakened.