I'm still digging on Hilary Duff's husband's family. Matthew's dad Gerald Bair is a musician in New York. Here he is doing a gig with Anthony Weiner.
https://www.newspapers.com/image/479410250/?terms=Gerald%2BBair
It looks like Gerald Bair had a regular gig at "The Bottom Line" in Greenwich Village. I recall Q saying that Andy Warhol was involved in this mess. Here is a picture of Andy Warhol at The Bottom Line.
https://en.wikipedia.org/wiki/The_Bottom_Line_(venue)>(You