Crossword puzzle clue "three note refrain"

Here are the possible solutions for three note refrain clue

Answer
Clue
Relevancy
eieio
Clue
Three-note refrain
Five-note refrain
"Old McDonald" refrain that I guess is supposed to teach kids three vowels?
brainteaser
Clue
"If three hens lay three eggs in three days ...," e.g.
Definition
something (as a puzzle) that demands mental effort and acuity for its solution
sos
Clue
Three short, three long, three short
eio
Clue
Last three syllables of a farm song refrain
yeah
Clue
When sung three times, part of a Beatles refrain
ela
Clue
Note of note in crosswords

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