Is this an Australorp thing? Mine starts her bock bock BAWK-ing at around 7:30am and will keep going for usually an hour, unless a cat happens to walk by, then she won't shut up. She's SO loud, and at first I thought it was her egg song, but she doesn't lay until about 10am or later; I think she's just... singing.
Luckily I only notice it when I'm in the back of the house, and I hate my neighbors so the noise level isn't an issue for us (I actually put the coop as close to their house as the law would allow- yes I'm that immature). Anyway, I wonder if that's an Australorp trait? Pretty interesting!