You've heard her music, you just don't remember where.
I went last night with a friend who worked as Yamagata's de facto publicist (and Web designer) when she was just starting her solo career ten or so years ago. That means we were close enough to the stage that my little camera phone actually got a result:
Yamagata usually does really long sets; last night's went almost to midnight. She played mostly songs from her last two releases, and only one or two from her debut, Happenstance. On that point she expressed what some of us were thinking: wow, has it really been that long? (The album came out nine years ago today.)
I also have to say how much I like Lincoln Hall as a venue. It's casual, but you can tell the crew and lighting guys know what they're doing. And nothing beats getting front-row seats—or, anyway, front-row real estate to stand on.