103.9 W280EM Chicago/WTMX-HD2 segued to its "Groove" identity with a rebranded take on Smooth Jazz. Branded as "Contemporary Jazz For Chicago", 103.9 debuted with David Sanborn's "Chicago Song". More details on Friday. Original Report 12/8: Windy City Broadcasting has signed on 103.9 W280EM Chicago. The translator debuted on Friday evening with Christmas Music with programming