Conversation so far:
What was happening in Jeff Tweedy's personal life?
Jeff Tweedy has been prone to migraines throughout his entire life.
Did Jeff Tweedy ever figure out the cause of his migraines?
Jeff Tweedy attributes this to comorbidity with major depressive disorder and severe panic attacks.
Did Jeff Tweedy seek help for his migraines and mental health issues?
In 2004, Jeff Tweedy entered a dual diagnosis rehabilitation clinic in order to receive treatment.
Did Jeff Tweedy's treatment for his health issues work?
John Stirratt claimed that this significantly improved the focus of Wilco.
What did the band Wilco do next after member Josh Tweedy received treatment for his health issues?
In 2008, Spencer Tweedy joined Wilco on stage at Madison Square Garden.
Were Wilco on a tour with Neil young in 2008?
Spencer Tweedy joined Wilco on stage at Madison Square Garden while opening for Neil Young.
What else was going on in Jeff Tweedy's personal life?
Jeff Tweedy is married to former talent agent Sue Miller.

Question: Who was Sue?
Self-contained rewrite: Who was Sue Miller?