Once in a _, a Rare Occurrence
This page is the CodyCross answer for the clue below from Concert Hall, Group 584, Puzzle 1 (Famous Composers).
Question
Once in a _, a Rare Occurrence
Answer
BLUEMOON
Word Meaning:
BLUE MOON — (countable) An extra full moon that appears in a subdivision of a year, namely:
Definitions from Wiktionary.