etcjoe:

I questioned him on perhaps he may have just heard someone sing it,
and learned from someone he knew. (Even asked if maybe he had written it himself!).
He's certain it was a commercial recording from his early years, and it's not like he's "losing it".
Even at 97 he still has a repertoire of literally dozens of songs he can do without words or chords,
and many hundreds more that he can do with a song sheet in front of him.

He continues to amaze me.
Hope I'm that lucid at 77 never mind 97!

Thanks for taking the time to search!
LLOYD S