Fascinating composition! A clue to the arrival of the birds (other than the cd cover) is the pecking pizzicato notes just prior. The initial bird sounds are recognizable to me. I have several bird feeders in my yard, and the house sparrow and starling chirps, with the occasional crow caw, are familiar. The string quartet “interruptions” don’t seem to phase the birds at all. The bird chorus at the end includes a new “basser” avian voice I don’t recognize. Finnissy’s work is completely new to me. Thanks for posting.