From PP&M's "Peter, Paul and Mommy"

MOCKINGBIRD
(Adapt. & Arr. by Travers/Stookey/Yarrow)

Hush little baby, don't say a word
Pappa's gonna buy you a mockingbird

If that mockingbird don't sing
Pappa's gonna buy you a diamond ring

If that diamond ring turns brass
Pappa's gonna buy you a lookin' glass

If that lookin' glass gets broke
Pappa's gonna buy you billy goat

If that billy goat don't pull
Pappa's gonna buy you a cart and bull

If that cart and bull turns over
Pappa's gonna buy you a doggie named Rover

If that dog named Rover don't bark
Pappa's gonna buy you a horse and cart

If that horse and cart fall down
You'll still be the sweetest little baby in town.