Hi

My Mum and her Mum used to listen to the Spinners in the 70s I looked up the albums they had and downloaded all the tracks of you tube but the mechanical blackbird was not on there but its probably the best song they did.
apparently it was the b side to Stop look listen in 1967.

The first line is

As i walked back to home from the ciiiity .
I saw a little blackbird in the tree
and i though i think they are pretty
while we are stuck in our own little trees.

Chorus.

To my tree dulalee dulalee dulalee
my tree dulalee dulalee.
I heard this sweet voice from the blackbird..
So who iam me sweet loving dulalee.

Not heard it for 30 years but its something like that

Ivan from Kent