Thank you, Steve.

I see that I made a typo. My post should have said

"... so why not by YOU or by your source..."

I was at a concert by a band from Scotland once, and the leader said, "You go to the pub, hear a new tune, and walk home singing it in your head. What you remember in the morning is how it now goes."

So there is always room for change and variation with old tunes.