I dunno, there's still plenty of ink spilled on the "authenticity" question, even if it's mostly in a slightly different tenor than the old debates over selling out. I think, at root, it's because other than maybe poetry (which is of course as far removed from the realm of corporatization as something can possibly be), lyrical music has, since the birth of the singer-songwriter, generally been considered to be the most "personal" artform out there, and thus the one most in danger of being "betrayed" by inauthenticity.