Answer: rubadubdub

AnswerCrossword Clue
RUBADUBDUB

Nursery rhyme intro

RUBADUBDUB

Start of a nursery rhyme

RUBADUBDUB

Start of a rhyme featuring a butcher and baker

RUBADUBDUB
Nursery-rhyme sound
RUBADUBDUB
Nursery rhyme starter
RUBADUBDUBFirst line of a nursery rhyme
RUBADUBDUBCertain nursery rhyme intro