ComfortablyNumb
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there are tons of thoughtful rap artists. Common, KRS-One, Lupe Fiasco, K-os, The Rootd, Mos Def just to name a few. plenty more thoughtful than the senseless lyrics kurt cobain wrote
Dude get some new material seriously. There are countless other artists with senseless lyrics (which are mostly cryptic lyrics.) Jim Morrison, John Lennon, Lou Reed, Francis Black. You get the point.