poetry vs. songs

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Idea: cryptically deep puzzling lyrics, meant to be studied and dived into and shit, are more appropriate for poems than songs. with poetry, you CAN study the words because you can SEE them, but with a song it should be more direct so that they can be appreciated whilst hearing them.
Plus, the more complicated and cryptic the lyric is, the more simple the song should be, so that it functions more like a poem and less as music. i.e. it should be sung in really simple repetitive melodies (like Thanskgiving). and the more musically-complicated and thus lyrically-hard-to- follow, the more easy the lyric should be to understand.