Radio Add Recap

THE "HEY BUDDY" SYSTEM: Capitol's Katy Perry is #1 Most Added at Top 40, followed by Columbia's Beyoncé (who's Most Added at Rhythmic), while Black Magnetic/Epic's A Great Big World starts picking up even Rhythm-Leaning Pop stations. Meanwhile, Merge's Arcade Fire rules the Alternative roost. Find out more about the action at three key radio formats in our Tuesday add recap, and don't be stingy with the hooch. (12/17p)