A couple of interview quotes I liked:

August 2009
http://www.plumtv.com/videos/2009-telluride-red-white-blues-concert-grace-potter-the-nocturnals/

“Musicians don’t want to be compared to somebody else.  I don’t mind the comparisons that much; but I do think if I sound like anybody, or if I’m aiming to sound like anybody, it tends to be male singers like [Lowell George, Robert Plant, Neil Young].  There’s certain voices that I try to channel, and it’s never a female one.  So when people say, “Oh – Janis Joplin,” it’s like “Really, dude”?

December 2009
http://www.pointfm.com/grace-potter-and-the-nocturnals.php

Writer/singer/keyboard player Potter, guitarist Scott Tournet and drummer Matt Burr had planned on holding extensive auditions for the vacant bass slot in New York and L.A., but they first checked out Popper on a recommendation. “She came in, plugged in and played with us,” Grace recalls, “and by the end of the first song we knew she was absolutely, positively the perfect person for us. She completely understood the direction we wanted to go in.”

After Yurco sat in with the band, including Popper, during their performance for a special VH1”School of Rock” 40th anniversary of the Woodstock Festival (they played “White Rabbit,” “Woodstock,” Janis Joplin’s “Try” and one original, “Nothing But The Water”), “We all had that new-band buzz,” Grace recalls. “We thought that if were making a lineup change, why not make it a whole new experience? Because we couldn’t really replace Bryan—he’d been with us too long for that. So having five members has made it a positive transition for all of us.”