Something to sing … or a hint to 17-, 23-, 31-, 40- and 45-Across’s starts

Now we are looking on the crossword clue: Something to sing … or a hint to 17-, 23-, 31-, 40- and 45-Across’s starts.
it’s A 76 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: THEBLUES.