Only because you're speaking about Cobain

I want to insert here that you do understand this was deliberate right? Well, except for purpose...that is untrue. There was definitely purpose to his work.
I think a part of what lullabelle was attempting to express when saying "all INFP musicians are crappy" ...
It's almost as if you're saying - we (NFPs) are playing to the best of our abilities and are unfortunately incapable of reaching the same level of refinement as the NFJ...and subsequently this is evidence for why White couldn't possibly be an ENFP.
Cobain was a musical genius that transformed...shit everything having to do with music (haha I don't know what to say)...and I promise you this wasn't a "happy accident."