[link to original on tumblr]
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A few days ago, I wrote about the "for" in "To Julia for When She Smiles" and how it's actually a conjunction. It occurred to me later that while it's a conjunction in the lead vocals, it's a preposition in the backing vocals because they consist only of "Julia / For when she smiles." There's a different meaning, which hinges on whether "for" is a conjunction or preposition, depending on whether you're paying more attention to the lead vocals or to the backing vocals.