Answer: EARWORM

AnswerCrossword Clue
EARWORM"It's a Small World," for one (sorry)
EARWORMAptly named corn pest
EARWORMStuck song syndrome sample
EARWORMYou can't stop humming it
EARWORMFar-too-memorable song
EARWORMTune you just can't get out of your head
earwormA catchy song or tune that runs continually through a person's mind
earworma tune which keeps persistently playing in your mind