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Kim Gordon would be it for me.  I like John MacAuley too.  Patti Smith would be cool.  I also wouldnt mind something completely unexpected like Andy Shauf or Alica from the band "Bully"      It took a lot of convincing on my friend's part.  I wanted nothing to do with it, but there were so many other amazing acts on the bill, if the nirvana thing sucked it was worth it to see the rest.   I was way up in the rafters in quite possibly the worst seat in the house.  Still loved every second of it.  Lots of tears. 

Lovely, something similar!  

Whilst (in my opinion)  it would be amazing, i'm just not sure that G would ever pay the fee. He is a proper superstar DJ from the time when superstar DJ's were being paid mega money and has done long residences in Las Vegas.    That being said, other headliner would be the obvious choice as the "electronic" headliner - too big for any of the EDM specific stages IMO. 

Whilst I agree with all the responses, this is a sympathy post for the OP. 

there's going to be (as usual) some serious clashes. Dreading the timetable. Helps that I've seen a ton of these before.