When my light sussex hen sings her song , it starts a chain reaction. Before you know it , it's a full choir. Perhaps if you explain to the neighbours that it is a song of joy and present them with some eggs they will begin to look forward to the sound.
Like training a dog really hahahaha my silkie is the noisiest Parsely goooosh that hen can make some noise! My neighbors love it though, maybe your's will too you'll be surprised i thought mine would kill me because they hate that i feed the magpies hehe ooppss but now he wants to kill me because his wife wants chooks and is nagging him to build her a coop!