Do you think that Kurt Cobain's mental liquidity made him the musical genius he was or held him back from being an even greater artist?

It is profoundly sad to me that humanity missed out on all the music he and Nirvana could have made. Granted Dave Grohl and the Foo Fighters have made some incredible music since then, but they are no Nirvana(on purpose).

I just heard Breed on the radio and got to thinking and thought I’d tap the collective for some discussion.