As part of "The Avant Garde Coffee House Project" exhibit currently on view, there's a glass-topped case with some posters and a record. It's a pretty nondescript thing, frankly, with a black and white photo and some not especially artful text. But that little record - "Blues, Rags and Hollers," by folk blues trio Koerner, Ray & Glover - made a big bang when it was released in June 1963. And it was made in Milwaukee.