The big radio story of the past week has been the top 20 debut of Katy Perry's "Roar" on both the Top 40 and Hot AC charts. She's a triple HitPredictor this week, at Top 40, Hot AC and Mainstream AC. Lady Gaga has also had a strong first week with her new single, "Applause." She nabs a HitPredictor at Top 40. And Drake has a double HitPredictor this week, as his new single, "Hold On, We're Going Home" scores at both the Rhythmic and Urban formats.