Meh.
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I can't believe anyone would put her in the same class as Hendrix, Joplin, Morrison and Cobain.
And what class would that be beside tragic burn-out druggies who threw their own lives and talent away?
Their "music" quality is certainly a personal call and I only think one of the four you mentioned is worth more than a footnote in even pop-music history (which itself isn't very important)