"Pinking" is a good word for that evening blackbird sound. I wonder if it came from the same word that used to be used for car engines "knocking", back in the days when pre-ignition was quite common. My old Handbook of British Birds says "Common note of, so to speak, mild protest, when disturbed, but not seriously alarmed, is low 'tchook, tchook, tchook..." but distinguishes this from "An irritating, persistent 'chick-chick-chick - - -' is much used when going to roost and also as a scold at owls, cats, etc."
(Good news in our dreary wet grey and soggy winter here in Sussex is that for the last three days the blackbird in our poor dying elm tree by our front yard has at last started its spring song.)