First. You may be wondering about the words "Pop Underground." The definition is simple: The people interviewed in this book are not "pop," as in the widely recognized popularity and visibility of a Sinatra or a Warhol. But neither are they "underground" - as in "unknown" - figures either, although they once were - as were Sinatra and Warhol, I presume. For now, they exist between these categories: each has a growing audience, while creating work independent of the slick veneer required of a commercial artist. Thus, "Pop Underground."