Classic question answered six times in this puzzle

Question:

Answer:

WHATISART

Length:

Similar Crossword Questions:

1993 dance hit, and a question answered seven times in this puzzle
Cult classic whose title is depicted four times in this puzzle
Sinatra classic, and hint to what's missing from this puzzle's other classics
First of a pair of letters swapped six times in this puzzle's theme entries
Subject of the Final Jeopardy! question that knocked out Ken Jennings after a record 74 wins ... or a hint to this puzzle's theme
Today, to CaesarÂ—and a hint to the hidden word appearing in this puzzle 15 times (including the one in this answer)
Times in a classic Yuletide carol
"I'll take 'The New York Times Crossword Puzzle' for $200, ___"
Apt question concerning 10 answers in this puzzle
Start of a classic question
___ accent, mark used symmetrically six times in this puzzle's solution
With "The," classic novel, each of whose major characters is hiding in a row of this puzzle
Classic breakup line, and a hint to the formation of this puzzle's theme answers
Buffoon in modern-day slang, and word hidden five times in this puzzle
Question not asked in this puzzle's theme words
Classic rap outfit whose more famous members are circled in this puzzle's theme answers
Word "positively" hidden four times in this puzzle
Twice, a New York Times puzzle
Noted arcade classic, and this puzzle's theme
June event 'remade' six times in this puzzle
Classic cartoon question
Theme of this puzzle, seen seven times in the grid
Word appearing eight times in this puzzle grid
Question answered by "M" or "F"
Traffic sign literally violated 12 times in this puzzle