Well, its certainly easier to remember a song than a poem, so, perhaps humans would set poems to music even if their orignal form was spoken. Possibly the verse form was learnt from the Sindar, & the music added by men.
Having said that, & knowing how touchy Elves could be regarding 'tradition', I see no reason that the Elves would not choose to set some of their verses to music. For instance, while I can't see the Narn being sung, I could see 'Winter comes to Nargothrond' being, & that's in the alliterative metre.
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