The Distinction Between Poetry In Music and Poetry In Literature

Referring to the discussion we had in class where some argued that today's music has no poetic value because of its repetitive verse and simplistic language, I'd like to delve into my own opinion of the matter.

When I read the posts from two weeks ago about everyone's form of poetry, I noticed that a majority if not all the posts were about the lyrics of the song, as if that alone made it poetic. This is the problem with analyzing music as poetry. The whole point of music is that there is so much more than the lyrics. Isn't that the obvious separation between music and literature? One of the songs I really wanted to talk about was "Two Weeks" by FKA Twigs, because the fluidity of her electropop sound and the raspy drum progression creates a song that is kind of elegiac and induces a lot of emotion, however the lyrics themselves are no prize (and also NSFW). Nonetheless, are we to diminish the quality of that song because it doesn't fit our concept of poetry, a concept that should strictly refer to literature? When I think of music as a form of poetry, the multidimensional language does not stem from the lyrics alone, but rather the chord progressions and other musical elements that layer on the nuances that lyrics alone cannot express.