Taylor Swift scores her third HitPredictor this week for "Shake It Off," at Mainstream AC. She scored a double HitPredictor last week, at both Top 40 and Hot AC. Meghan Trainor also nabs her third HitPredictor this week, for "All About That Bass," at Hot AC. She previously nabbed it at Top 40 and Rhythmic. And Sam Smith earns an amazing fifth HitPredictor for "Stay with Me," at Urban. He's already been a HitPredictor at Top 40, Hot AC, Mainstream AC and Rhythmic.