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I don't think that taking a form was a prerequisite of entering Arda, more like a personal choice. Concerning the use of language for making verses, stories or song, we know that Yavanna used song in her making of the trees and that poetry was of a particular delight to Manwe, who taught it (along with singing) to the vanyar.
Sauron's most oustanding "poetical" moment ought to be his battle of songs of power with Finrod (outstanding moment), although I presume that inner power had more to do with it that pure poetic skill.
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