Nearly two feet of newly fallen snow proved little obstacle for fans to clap their eyes on musician Bill Callahan on a recent winter's night. Callahan, known to many by the name Smog, drew a hip crowd to Spoonbill and Sugartown in Williamsburg, Brooklyn, for a reading from his novel, Letters to Emma Bowlcut. The book, read in the author’s halting, sonorous voice, consists of correspondence written by a man to a woman he met at a party. Readers aren’t provided much context for the meeting but can sense the relationship develop as the letters progress.