'Old MacDonald' sequence found in this puzzle's 10 longest answers

Question:

Answer:

EIEIO

Length:

Similar Crossword Questions:

Sequence found in this puzzle's five longest answers
Regular stuff found inside this puzzle's three longest answers
They're found at the end of this puzzle's longest answers
Exhibit found in this puzzle's four longest answers
String of letters found in this puzzle's longest Across answers
Surprise quiz found in the eight longest puzzle answers
Boat lifters found in this puzzle's three longest answers
They're found at the ends of this puzzle's three other longest answers
"Dough" found in this puzzle's four longest answers
Bar found at the end of this puzzle's seven longest answers
Workweek start, or an apt title for this puzzle based on an abbreviation found in its five longest answers
They are found in this puzzle's three longest answers
"Figure head" found in this puzzle's longest answers
Things found in this puzzle's eight longest answers
Corp. transfer found in this puzzle's four longest answers
Stocking stuffer found in seven of this puzzle's longest answers
Easter bunny's spring, found in this puzzle's nine longest answers
Geeky sort found within this puzzle's four longest answers
Commerce minder found in eight of this puzzle's longest answers
AprÃ¨s-___ (following a day on the slopes -- and, literally, where the first words of the four longest puzzle answers can be found)
Dream found in this puzzle's seven longest answers
Narcissists' interests (one of which can be found in each of the puzzle's longest answers)
Commercial interruptions literally found in this puzzle's three other longest answers
Org. with members found at the ends of this puzzle's three longest answers
Pentecost, e.g., and what can literally be found in this puzzle's four other longest answers