Answer: EIEIO
The answer EIEIO has 163 possible clues. See the results below.
Possible Clues:
- Vowels in "Old MacDonald"
- Refrain in 51-Across that accompanies the sounds at 24-, 37- and 47-Across
- All-vowel refrain in a kids' song
- Refrain in a song with the words "With a moo moo here"
- Singalong quintet
- Children's song refrain that's all vowels
- Letters preceding "with a moo-moo here"
- Nursery refrain
- "With a moo moo here ... " preceder
- Refrain from nursery singing