Macca had asked Lennon if he would join him on it, but Lennon refused.
that sounds like bullsh*t to me...can you offer up some evidence if it is not to much trouble.... :-/
I know I read it somewheres, but now I don't remember where. I thought it was from Wikipedia, but no. I'm curious now myself, I know I didn't dream it. If I stumble across it, I'll post.