There was a time when listening to jazz on the radio was a highly personal experience. Disc jockeys like New York City’s Symphony Sid laid down a carpet of lush-toned introductions, their tune ...

At the start of 2008, everything was going well at Chicago’s WNUA 95.5-FM. The smooth-jazz station ranked in the top five in the city in listeners age 25 to 54, and its research showed that the ...