Answer: nanana

AnswerCrossword Clue
NANANAMy Chemical Romance song, or 1-3 of its subtitle
NANANA"Shoop Shoop Song" syllables
NANANA"The Night They Drove Old Dixie Down" syllables
NANANA"Get a Job" syllables
NANANARepeated sounds in "Hey Jude"
NANANALyric stand-in, perhaps
NANANA"Hey Jude" sounds
NANANARefrain bit
NANANARepeating part of "Hey Jude"
NANANARefrain syllables
NANANALyric substitution, perhaps
NANANAPart of the "Hey Jude" refrain