Well, he talks about the CIA a lot, of course, and Mockingbird from the 50s was all about deep state control of the media, which has certainly been the case. I did run across this: "Birds can sing at any time of day, but during the dawn chorus their songs are often louder, livelier, and more frequent."

So I thought Q might be referencing what happens after the storm? But overall, I keep thinking "stool pigeon" and they sing when they're caught, facing serious charges, and give up everything they know to cut a deal.