Most birds who live in flocks, are very talkative and noisy when doing flock things; especially bathing. I think it is a way of making sure the flock stays in contact while doing something that is not necessarily completely safe. My tiels also flock talk when they are actively foraging. They flock talk, or rather scream, when they are doing a flight panic, of course. It seems they start out with "flee, flee" and the calls change to "I am here, are you here too?" looking for everyone.
Emmie CAG talks the most when he hears me in the kitchen or the catroom and he cannot see me. We "talk" back and forth as I work. When I first go into the birdroom, the flock of tiels does a panic flight and their contact calls, during which Emmie is totally silent. After I am in the room for about half an hour, Emmie starts talking to me and interacting. He continues with the verbal interaction all the while I am there, during different "sessions". Emmie is the most verbal bird I have.
Sunny Senegal rarely vocalizes except as contact calls to me when I am out of the room. Once I am in the room, she is silent until she eats her fill of the treats I have brought with me and she settles down for scritches and cuddling against my cheek and ear. During that time, we have little whistles and clucks, chirps and kiss noises which are our own special language between us.
I have now had Oscar RedBellied for 18 months. Originally he was totally hands off except for step ups to be caged or for health checks every month. He was extremely stand offish and unhappy; he was with his original owner for nine years before I got him. Oscar was very noisy when I first entered the room or when I wanted to do something individually with him for the first eight months. He wanted absolutely NO hands on him, however, and I allowed him is choice. Over the past nine months, he has become much more interested in verbal interaction and is now tolerating me to interact verbally with him on a face to face basis. He has become so interested in interacting, he will verbally communicate with me for up to fifteen minutes, then accept a treat and take it and fly away. I feel soon he will be hands on. Oscar has a very loud, discordant contact call which he does when I come into the room, as I leave the room, and when he decides he wants to interact with me. Oscar also says his name, calls for "Kathy", yells "NO" and repeats "night night" often. I know he can say more words, I have heard him practicing them under his breath, but he has not actually said them to me.
The noisiest of my flock is the GCC, Boca. He is constantly yelling in his very loud contact call. He is an interesting bird, half loving and cuddly, half aggressive and bitey. It has been interesting to forage a friendship with him because he has a fear of hands. If he cannot see the hands, he loves to be scritched and petted; if he can see the hands, he bites, hard.
My canary, Kirk, sings at dawn, during the middle of the day, and again at dusk. He has a beautiful voice and I love his songs. He includes some notes from a mocking bird and from a cardinal in his song. He has no hens yet to interact with, and I am working to get him a small flock.
Generally, the flock calls aloud at dawn, during rain storms, especially lightning and thunder, and that is it.
My greys chitter chatter all day. Nothing annoying. When we eat they get a bit louder asking for foods as they want us to share. The zon girls also talk and sing through out the day, but at sun down they can get going. They especially with talk back if we talk to them. 
I think maybe soon he'll decide to play in it and take a bath, plus make a mess and talk, chirp, and preen like a maniac with some luck 
