Real? Hoax? LOL...I'm leaning towards hoax.
Apparently these noises are being heard everywhere, including Sydney and Melbourne (they have their own separate videos, not hard to find).
People are saying it's Biblical, others are saying it's Jewish, others are saying it's dragons. That's right, dragons!!! I'm guessing it's part of the 2012 scaremongering and also, some of these noises can be put down to birds migrating in big flocks anyway...however I am sure most of the noises are computer generated sounds created by bored geeks .
What do you think?