@StradivariusBone, Since you brought up Nirvana, I think you would enjoy watching Sound City if you haven't seen it already. Timely consider the recent passing of Rupert Neve.
Trent Reznor sums this thread all up at the end there.
Also, Paul Mccartney fronting Nirvana!? And I love how Pat Smear is starstruck. So unbelievably cool. Thank you for sharing that! I knew Sound City gave birth to Fleetwood Mac, but all that history was amazing. That Neve has to be supernatural.