ExplanationThe blank describes the kind of lyrics that would create a tension with cheerful, almost bouncy music, so a word that means something like sad would make sense. Both euphoric and sanguine are nearly the opposite of what you’re looking for, so eliminate choices (B) and (C).
Neither lubricious, which means lewd, nor recondite, which means not widely known, is supported by the sentence, so eliminate choices (A) and (E). Both saturnine and lachrymose mean sad, so choices (D) and (F) give you appropriate, equivalent sentences.
Hence options D and F are correct!
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