Clear Channel – the company that owns hundreds of radio stations in the US, is making use of sophisticated editing and mixing to splice together shows for local markets that sound local, but in actuality are recorded in studios often thousands of miles away. “With a lot of cutting and pasting, the engineers create 11 customized hourlong countdown shows for cities like New York, Philadelphia and Detroit, and two national pop and rhythm-and-blues countdowns for other markets…” Carson Daly, the host, doesn’t even know which songs he’s introducing on his shows.