Answer:

LALALA

AnswerCrossword Clue
LALALARefrain part
LALALA"IcanthearyouIcanthearyouIcanthearyou"
LALALAMonotonous lyrics?
LALALACarol sequence
LALALA"Deck the Halls" ending
LALALA"Deck the Halls" sequence
LALALA"I don't remember the words..."
LALALARefrain sequence
LALALABobby Sherman song alternatively titled "If I Had You"
LALALA"I can't HEAR you!"
LALALASyllables sometimes said with one's fingers in one's ears
LALALAFingers-in-one's-ears syllables
LALALA[I don't remember the words]
LALALASung syllables
LALALALyric-forgetter's phrase
LALALA"Sorry, can't hear you"
LALALALyric forgetter's phrase
LALALABobby Sherman hit subtitled "If I Had You"
LALALAVoice training exercise.
LALALASoprano's warm-up
LALALAMusical refrain syllables
LALALAChorus syllables
LALALA"Deck the Halls" syllables
LALALA"I'm not listening to you!"
LALALA[I can't remember the words to this song]
LALALA"I can't he-e-ear you ...!"
LALALARepeated part of "Deck the Halls"
LALALA"I'm not listening ..."
LALALALine forgetter's substitute
LALALA[I'm not listening ... I can't he-e-ear you!]
LALALA"I can't he-e-ear you!"
LALALASyllables sung when you forget the lyrics
LALALASinging syllables
LALALALead-in to 'I can't hear you!'
LALALARefrain syllables
LALALAAll-purpose lyrics
LALALA"I'm ignoring you!"
LALALA"I don't remember the words ..."
LALALAChorus syllables, perhaps
LALALARefrain section