Looking for the lyrics of a song that I heard years ago - I have little bits of it.

Come and I will sing you.
What will you sing me
I will sing you one-O
One of them is all alone and evermore shall be so

Come and I will sing you etc..

Other bits are (possibly!)
Two of them are lilywhite boys cloth-ed all in green-o
?Three of them are strangers?
Four for the cheerful waiter
Five for the ferry man in his boat

....? it is the dilly bird that's seldom seen but heard-o

Any help greatly appreciated! Dave Hunt