Bryan Krull is not a musician. A University of Wisconsin graduate and recent publisher of the historical fiction 1920?s delta blues novel ?Lil? Choo-Choo Johnson Bluesman,? Krull literally cannot carry a tune. ?People ask me all the time if I play in a band or if I?m a skilled guitarist because I wrote a novel about blues musicians,? Krull saidl. ?I can?t. I think it?s because I was assigned the clarinet in middle school.?