GUEST,Just asking - As for the blackbird, it is just part of the imagery. This morning has broken and is just as beautiful as the first ever morning (actually, probably nicer, as there isn't as much ammmonia, sulphur dioxide and volcanic gases as at the start of the planet). (A) blackbird has spoken (sung), and the sound is as uplifting a sound as the first ever bird song...
A blackbird does not have the sinister significance of a carrion crow crow.
I expect that it was chosen because it scans as a lyric (sparrow or pigeon would just about fit) in the way that Albatross or Duck would not...
Quack!
Geoff the Duck.