grey i understand what you mean ...poetry doesnt have to be emotional ,it can be a variety of other techniques that interest the reader . i class some songs as poetry if it is written nice enough [and sooner or later songs will become poetry as i dont think it interests as many as it has in the past]
like books they can biographical ,using events in sequence to tell a story from the poets viewpoint....if i am to use a poem or song lyric to convey this i'd pick hazard by richard marx...the lyrics tell a story about mary and her demise.
again another style may be limericks ...does there once was a man from nantucket have a deep meaning ?nope just simple rhyme and language to make the reader giggle.
it all depends on the reader ,but emotional poetry is viewed as the best because those who read it feels a strong connection to the emotion it conveys ....we use them on greeting cards ,even at funerals,because the emotions we feel listening to them /reading them is relatable
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not everything has to be defined ....