Don't know about that.... Do know about this... In Dorothy Horstman's book Sing Your Heart Out Country Boy The writer [Vaughn Horton] is quoted as saying he wrote the song while riding a train during several visits to see his father in the hospital and when it was finished he sang it to his father and the nurses It became one of the biggest hits ever being recorded over 400 times and selling over 20 million copies

MOCKIN' BIRD HILL
Recorded by: Patti Page
Writer: Vaughn Horton

When the sun in the mornin' peeps over the hill
And kisses the roses 'round my window sill
Then my heart fills with gladness when I hear the trill
Of the birds in the treetops on Mockin' Bird Hill.

CHORUS: Tra-la-la twit-tle dee-dee - it gives me a thrill
To wake up in the morning to the mockin' bird's trill
Tra-la-la twit-tle dee-dee - there's peace and goodwill
You're welcome as the flowers on Mockin' Bird Hill.

Got a three-cornered plow and an acre to till
And a mule that I bought for a ten-dollar bill
There's a tumble-down shack and a rusty ol' mill
But it's my home sweet home up on Mockin' Bird Hill.

CHORUS

When it's late in the evening I climb up the hill
And survey all my kingdom while ev'rything's still
Only me and the sky and an ol' whippoorwill
Singin' songs in the twilight on Mockin' Bird Hill.

CHORUS