Theres something unsettling about any artists posthumous work.

But its particularly macabre in the case of Kurt Cobain, whose relationship to Nirvanas music was complicated.

The content is exceptionally raw: Most songs are snippets or free-form instrumental noodles.

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Credit: Kevin Mazur/WireImage

Vocals are rough and mumbly.

Other tracks arent even music, but rather sound tests (Reverb Experiment) and crazy-eyed comedy skits.

Whats most compelling about the set is how it captures Cobains passion and intensitynot his slacker-junkie persona.

Its hard to gradeMontage of Heck.

Considering sound quality and execution of ideas, its in the lower C range.