You don't spend five years in lock-up without killing more than a few hours down at the prison library. Don't let the wildman persona fool you. "Joliet' Jake was a serious student of the blues. He left us with a marvelous catalog of books on the music he loved — and inspired more than a few chroniclers to put pen to paper himself. Browse the shelves, dust off a cover, and learn what he'd want you to know.