Crossword Clue:

sung or chanted in syllables

AnswerCrossword Clue
ANTIPHONALSung or chanted in alternation
LASSyllables sung in place of unknown words
OBLASyllables before "Di" or "Da" in a Beatles title
OBLASyllables before "di" or "da" in a Beatles song
OBLASyllables before di or da, in a Beatles song